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• Webmin / Virtualmin running php as www-data, is locked out of viewing .htaccess and writing

  - by Kirill

  I've asked this on the virtualmin forums, but haven't had any help from there. Recently, "something" happened and it seems that the apache service has gone a bit weird. What it does: it runs all apache traffic as www-data and sometimes spawns the php5-cgi process as www-data, this is a problem because all the domain users own their directories and default permissions don't let www-data write to these folders (file uploads are dead) or read .htaccess (permalinks are broken in wordpress). I've googled this for about a week straight now, tried pretty much everything I could find and achieved nothing. The only thing that I think might actually be the cause of all this is this page: http:// - i.imgur.com/NYW3x.png (got shut down by the spam filter) So I figured if I set it to "default", this might magically start working again, but all it does is "crash" apache (all websites timeout). I figure it's something to do with the "mpm" module or something, but I can't find anything relevant in the settings to modify for it to work. Can someone please point me in the right direction? System info: Webmin version 1.580 Kernel and CPU Linux 2.6.35.4-rscloud on x86_64 Virtualmin version 3.90.gpl GPL Ubuntu 10.04 LTS (Lucid) A couple screenshots of top http://i.imgur.com/U2DTK.png http://i.imgur.com/sNPKs.png

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• Reverse proxy for mailserver (SMTP + HTTP for web client)

  - by gaqzi

  I'm looking at doing some reverse proxy work for a mail server with corresponding web client. Both servers are running on the same machine, this is not a server with a high load. :) The solution I've discussed with friends is having the mail server/web client on our internal network. Then to put a reverse proxy on the DMZ to service both SMTP and web client HTTP-traffic to the mail server on the internal network. From what I understand this is the recommended secure solution? So far I've thought for the SMTP-proxy part of using postfix which will receive mail, do some spamhause and similar anti-spam measures and if it all checks out, send the mail to the mail server on the inside. The mail server on the inside will send all outgoing mail to the proxy which will then send it out on the Internet. For the web client I'm not sure exactly which software I should be running on the proxy machine, I've been thinking about using Squid -- but that's basically based on the fact that I know squid is a http proxy. The web client data will be sent out over SSL. Reading around some here on Serverfault I've seen other people using Apache with mod_proxy+mod_security for similar situations. Am I thinking correctly for this solution? What software would you guys use and with which modules? Thanks in advance for the help! :)

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• SPF hardfail and DKIM failure when recipient has e-mail forwarding

  - by Beaming Mel-Bin

  I configured hardfail SPF for my domain and DKIM message signing on my SMTP server. Since this is the only SMTP server that should be used for outgoing mail from my domain, I didn't foresee any complications. However, consider the following situation: I sent an e-mail message via my SMTP server to my colleague's university e-mail. The problem is that my colleague forwards his university e-mail to his GMail account. These are the headers of the message after it reaches his GMail mailbox: Received-SPF: fail (google.com: domain of [email protected] does not designate 192.168.128.100 as permitted sender) client-ip=192.168.128.100; Authentication-Results: mx.google.com; spf=hardfail (google.com: domain of [email protected] does not designate 192.168.128.100 as permitted sender) [email protected]; dkim=hardfail (test mode) [email protected] (Headers have been sanitized to protect the domains and IP addresses of the non-Google parties) GMail checks the last SMTP server in the delivery chain against my SPF and DKIM records (rightfully so). Since the last STMP server in the delivery chain was the university's server and not my server, the check results in an SPF hardfail and DKIM failure. Fortunately, GMail did not mark the message as spam but I'm concerned that this might cause a problem in the future. Is my implementation of SPF hardfail perhaps too strict? Any other recommendations or potential issues that I should be aware of? Or maybe there is a more ideal configuration for the university's e-mail forwarding procedure? I know that the forwarding server could possibly change the envelope sender but I see that getting messy.

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• Exim log and send all mail for a given domain through another server

  - by Josh

  I administer a handful of shared web hosting servers. Recently, Yahoo has been deprioritizing/greylising all email sent from these servers. I am getting the dereaded 421 4.7.0 [TS02] Messages from my.ip.address temporarily deferred message from Yahoo and their postmaster has been unresponsive. I am unable to find any way to set up a feedback loop like AOL has for my IP address -- I did find a way to set up a feedback loop for a given domain, but we host hundreds of domains, and don't have the time to set up that many feedback loops. So what I'd like to do is twofold: Configure Exim to send all email destined to an @yahoo.com address to a relay, a new server which has an IP that yahoo is not blocking. Configure Exim (or maybe the relay) to log all emails sent to @yahoo.com, so I can review them and, in case one of my uses is violating ToS and sending SPAM to yahoo users, take the appropriate action. How could I accomplish these? Or, does anyone have any other advice for how to get mail to flow through Yahoo and ensure that any email generating complaints is brought to my attention? (For what it's worth, these servers are not listed on any major blacklists)

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• Zimbra MTA settings

  - by user192702

  Hi have some questions for Zimbra v8.0.6GA. Under Configure - MTA - Network, I'm seeing a few settings and am not very clear what to do with them. Web mail MTA Host name Is this for delivering local mail only (ie not for external mails)? According to this link, it says the following. That's a mouthful but what is "composed messages"? Is this for a multi server deployment where the Postfix server for Zimbra isn't installed on the same box that as the rest of the servers? Webmail MTA is used by the Zimbra server for composed messages and must be the location of the Postfix server in the Zimbra MTA. Relay MTA for external delivery My understanding after reading the doc is that if my ISP doesn't force me to relay outgoing mails through them, and I have enabled DNS lookup, I can leave this blank? Inbound SMTP host name Sorry I know this is explained as "If your MX records point to a spam-relay or any other external non-Zimbra server, enter the name of that server in the Inbound SMTP host name field." but I'm not following. Can someone provide an example? MTA Trusted Networks The admin doc says "To set up MTA trusted networks on a per server basis, make sure that MTA trusted networks have been set up as global settings and then go the Configure Servers MTA page and in the MTA Trusted Networks field enter the trusted network addresses for the server." However I see out of the box it has default networks setup for the server whereas on a global level it's blank. Does this mean there is a bug with the install software and I have to copy the setting from the server to the global setting?

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• IIS URL Rewrite HTTP to HTTPS with Port

  - by Andy Arismendi

  My website has two bindings: 1000 and 1443 (port 80/443 are in use by another website on the same IIS instance). Port 1000 is HTTP, port 1443 is HTTPS. What I want to do is redirect any incoming request using "htt p://server:1000" to "htt ps://server:1443". I'm playing around with IIS 7 rewrite module 2.0 but I'm banging my head against the wall. Any insight is appreciated! BTW the rewrite configuration below works great with a site that has an HTTP binding on port 80 and HTTPS binding on port 443, but it doesn't work with my ports. P.S. My URLs intentionally have spaces because the 'spam prevention mechanism' kicked in. For some reason google login doesn't work anymore so I had to create an OpenID account (No Script could be the culprit). I'm not sure how to get XML to display nicely so I added spaces after the opening brackets. < ?xml version="1.0" encoding="utf-8"? < configuration < system.webServer < rewrite < rules < rule name="HTTP to HTTPS redirect" stopProcessing="true" < match url="(.*)" / < conditions trackAllCaptures="true" < add input="{HTTPS}" pattern="off" / < /conditions < action type="Redirect" redirectType="Found" url="htt ps: // {HTTP_HOST}/{R:1}" / < /rule < /rules < /rewrite < /system.webServer < /configuration

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• SpamAssassin 2010 Bug still active on my mailserver despite the offending rule being fixed - where t

  - by Ibrahim

  The SpamAssassin 2010 bug was supposed to be fixed not long after the bug became widely known, and indeed the offending rule in my /usr/share/spamassassin/72_active.cf has been updated. However, incoming messages are still being tagged by this eg: X-Spam-Status: No, score=3.188 tagged_above=-999 required=6.31 tests=[BAYES_50=0.001, FH_DATE_PAST_20XX=3.188, SPF_PASS=-0.001] Here is the relevant rule: ##{ FH_DATE_PAST_20XX header FH_DATE_PAST_20XX Date =~ /20[2-9][0-9]/ [if-unset: 2006] describe FH_DATE_PAST_20XX The date is grossly in the future. ##} FH_DATE_PAST_20XX I'm on spamassassin/3.2.5-2+lenny1.1~volatile1 on Debian Lenny, completely up to date. Any pointers on where to look to figure out what's going on? I don't know anything about SpamAssassin; someone else usually manages this but I'm free right now and am trying to figure out what the problem is because it's been annoying us for a while and we only just realized this bug was still affecting us. Update: I've lowered the score for the FH_DATE_PAST20XX rule to 0.1, both in /etc/spamassassin/local.cf and /usr/share/spamassassin/50_scores.cf and it's still giving 3.188 points for this rule. Any idea what's going on? This really has me stumped. Update 2: It seems that after restarting amavisd, it's been fixed. What's the difference between amavisd and spamd? It seems like both should not be running, or something.

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• SpamAssassin 2010 Bug still active on my mailserver despite the offending rule being fixed - where t

  - by Ibrahim

  The SpamAssassin 2010 bug was supposed to be fixed not long after the bug became widely known, and indeed the offending rule in my /usr/share/spamassassin/72_active.cf has been updated. However, incoming messages are still being tagged by this eg: X-Spam-Status: No, score=3.188 tagged_above=-999 required=6.31 tests=[BAYES_50=0.001, FH_DATE_PAST_20XX=3.188, SPF_PASS=-0.001] Here is the relevant rule: ##{ FH_DATE_PAST_20XX header FH_DATE_PAST_20XX Date =~ /20[2-9][0-9]/ [if-unset: 2006] describe FH_DATE_PAST_20XX The date is grossly in the future. ##} FH_DATE_PAST_20XX I'm on spamassassin/3.2.5-2+lenny1.1~volatile1 on Debian Lenny, completely up to date. Any pointers on where to look to figure out what's going on? I don't know anything about SpamAssassin; someone else usually manages this but I'm free right now and am trying to figure out what the problem is because it's been annoying us for a while and we only just realized this bug was still affecting us. Update: I've lowered the score for the FH_DATE_PAST20XX rule to 0.1, both in /etc/spamassassin/local.cf and /usr/share/spamassassin/50_scores.cf and it's still giving 3.188 points for this rule. Any idea what's going on? This really has me stumped. Update 2: It seems that after restarting amavisd, it's been fixed. What's the difference between amavisd and spamd? It seems like both should not be running, or something.

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• Best Firewall product for hosting/housing environment?

  - by Raffael Luthiger

  I am searching for a firewall product (appliance or software) for an hosting/housing environment. The biggest problem is that the rules get very complex as more customers are behind the firewall. Some have only one server, others have a whole subnet. Some need NAT, some a VPN endpoint. Some customers want to only allow port http, others ssh as well. So the device needs to be able to support VLANs and it should be possible to group the rules per customer. Speed is another important point. And being able to manage redundant devices easily. I am searching for something that doesn't have all the extras like spam filter etc. I was searching a lot on the net but either they had all those extras as well (and with is an overloaded configuration interface) or they missed some of the features I need (e.g. VLAN). The VPN endpoint is not the an important criteria. We were thinking about a separate machine for it.

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• What is the advantage of not running as root? [closed]

  - by Shmuel Brill

  Possible Duplicate: What's wrong with always being root? All modern brands of Linux highly discourage (or disable) one from running as root instead of a normal user. I do not understand why. As a "normal" user, one could Download a rouge program from the internet. Run it (After all, one isn't root, what can it do). It installs itself in .bashrc or .xinitrc It writes a rouge "sudo" and "su" and adds . to the path Not noticing that . is in path, one runs sudo. The rouge program now has root password and can do anything it wants in the system. Even if 3-6 doesn't happen, the program could still Be part of a botnet. Read all files in the home directory and send them back (mine for SS#, Credit Card numbers, bank account numbers, etc). Send spam. Run a backdoor server to allow an attacker a chance to connect to the machine to determine vulnerabilities. It seems that the whole "permissions" thing (root/non-root) is just to prevent amateur crackers from getting into the system, so the question is: Is there a point in avoiding running as root, and is there a way to protect oneself if one wants to run unsafe code?

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• Blocking requests from specific IPs using IIS Rewrite module

  - by Thomas Levesque

  I'm trying to block a range of IP that is sending tons of spam to my blog. I can't use the solution described here because it's a shared hosting and I can't change anything to the server configuration. I only have access to a few options in Remote IIS. I see that the URL Rewrite module has an option to block requests, so I tried to use it. My rule is as follows in web.config: <rule name="BlockSpam" enabled="true" stopProcessing="true"> <match url=".*" /> <conditions logicalGrouping="MatchAll" trackAllCaptures="false"> <add input="{REMOTE_ADDR}" pattern="10\.0\.146\.23[0-9]" ignoreCase="false" /> </conditions> <action type="CustomResponse" statusCode="403" /> </rule> Unfortunately, if I put it at the end of the rewrite rules, it doesn't seem to block anything... and if I put it at the start of the list, it blocks everything! It looks like the condition isn't taken into account. In the UI, the stopProcessing option is not visible and is true by default. Changing it to false in web.config doesn't seem to have any effect. I'm not sure what to do now... any ideas?

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• Identifying mail account used in CRAM-MD5 transaction

  - by ManiacZX

  I suppose this is one of those where the tool for identifying the problem is also the tool used for taking advantage of it. I have a mail server that I am seeing emails that spam is being sent through it. It is not an open relay, the messages in question are being sent by someone authenticating to the smtp with CRAM-MD5. However, the logs only capture the actual data passed, which has been hashed so I cannot see what user account is being used. My suspicion is a simple username/password combo or a user account's password has otherwise been compromised, but I cannot do much about it without knowing what user it is. Of course I can block the IP that is doing it, but that doesn't fix the real problem. I have both the CRAM-MD5 Base64 challenge string and the hashed client auth string containing the username, password and challenge string. I am looking for a way to either reverse this (which I haven't been able to find any information on) or otherwise I suppose I need a dictionary attack tool designed for CRAM-MD5 to run through two lists, one for username and one for password and the constant of the challenge string until it finds a matching result of the authentication string I have logged. Any information on reversing using the data I have logged, a tool to identify it or any alternative methods you have used for this situation would be greatly appreciated.

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• Amazon AWS Ec2 instance, Elastic IP, Domain name from external domainseller, and Google Apps for Email

  - by Sid

  We are hosting our site on an Ec2 instance. Our Elastic IP is w.x.y.z and Public DNS is: ec2-w-x-y-z.compute-1.amazonaws.com. We've bought a domain name domainname.com from a lesser known domain-name-seller. We added an A-record pointing domainname.com to w.x.y.z. Will this work or do we need a CNAME record to point to the same too? We wanted to use Google apps for emailing so adjusted the TXT/MX records according to the Google Apps instructions to be able to send/recv email using @domainname.com email addresses. Have we got it right, more important, we came across queries relating to email sent from ec2-w-x-y-z.compute-1.amazonaws.com (our users can send email from their onsite accounts) going to spam (rDNS not pointing to domainname.com but to ec2-w-x-y-z.compute-1.amazonaws.com). How can we fix this? We came across SPF records, do they provide a complete solution? We aren't sure as to how to use them. Can you help pls? Thank you, Sid

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• do not require smtp authentication for a specific domain using hMail server

  - by toryan

  One of my clients has a needlessly complex e-mail setup for a couple of domains, which is causing problems when they try to send e-mail between them. They have a couple of domains where mail follows a slightly weird path: Users connect to an Exchange server to send e-mail The exchange server relays the message to an ISP-owned SMTP server as a smart host The ISPs server delivers the mail to the mail exchanger specified in DNS The mail exchanger is another server that runs hMailServer The Exchange server connects to the hMail server via POP3 and retrieves the messages. The problem arises when they send mail between addresses in the same domain, or two addresses that are present on the hMail server. hMail requires SMTP authentication when sending from local to local addresses, so the messages don't arrive. Removing SMTP authentication isn't really an option, as the server has been the target of spam being sent from spoofed local addresses. SMTP authentication prevents this. It is possible to add the ISP's mail server as an IP range with specific rules, but this seems inelegant. Bearing in mind I only have access to the hMail server and not the Exchange server, is there a better way of going about this?

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• Could this server log mean my server is being used as a proxy?

  - by So Over It

  I came across the following entry in my access.log: 58.218.199.147 - - [05/Jun/2012:12:56:04 +1000] "GET http://proxyproxys.com/ HTTP/1.1" 200 183 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)" Normally when I see a full URL entry in my access.log I assume it is log spam with people trying to get me to access their site. These entries are normally followed with a 404 response. The above entry is followed with a 200 'success' response! Doing some searching it would seem that this can occur when someone is trying to use your server as a proxy. This disturbed me more - especially because the URL in question has the word proxy in it. Going to the site 'proxyproxys.com' (using hidemyass.com to protect my own identity), the site returns what appears to be some sort of 'proxy judge' ---------------------------------------- HTTP_ACCEPT=text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 HTTP_ACCEPT_LANGUAGE=en-US,en;q=0.8 HTTP_USER_AGENT=Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_4) AppleWebKit/536.5 (KHTML, like Gecko) Chrome/19.0.1084.53 Safari/536.5 HTTP_CONNECTION=close REMOTE_PORT=56355 REMOTE_HOST=74.63.112.142 REMOTE_ADDR=74.63.112.142 ---------------------------------------- CS_ProxyJudge Result=HIGH_ANONYMITY ---------------------------------------- Question: 1) does the 200 success mean that someone has been able to successfully use my server as a proxy? 2) are there other means of confirming if my server is being used as a proxy 3) can you refer me to documentation to help 'close up' my security gap if there is one. Thanks.

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• Sendmail configs and logs look correct, but I get no mail

  - by Christian Dechery

  I used this tutorial to config sendmail on Ubuntu. Followed every step and when I test it, it seems to have worked, but I get no mail (not even on the spam folder) Below is the log for a test message: 050 >>> MAIL From:<[email protected]> SIZE=345 AUTH=<> 050 250 2.1.0 OK ek1sm23505399vdc.28 - gsmtp 050 >>> RCPT To:<######@gmail.com> 050 250 2.1.5 OK ek1sm23505399vdc.28 - gsmtp 050 >>> DATA 050 354 Go ahead ek1sm23505399vdc.28 - gsmtp 050 >>> . 050 250 2.0.0 OK 1401150762 ek1sm23505399vdc.28 - gsmtp 050 <########@gmail.com>... Sent (OK 1401150762 ek1sm23505399vdc.28 - gsmtp) 250 2.0.0 s4R0WdYN007263 Message accepted for delivery ######@gmail.com... Sent (s4R0WdYN007263 Message accepted for delivery) And this is my /var/log/mail.log May 26 21:32:39 UX-BLUEROOM sendmail[7262]: s4R0Wdxq007262: from=christian, size=105, class=0, nrcpts=1, msgid=<[email protected]>, relay=christian@localhost May 26 21:32:40 UX-BLUEROOM sm-mta[7263]: s4R0WdYN007263: from=<[email protected]>, size=345, class=0, nrcpts=1, msgid=<[email protected]>, proto=ESMTP, daemon=MTA-v4, relay=localhost [127.0.0.1] May 26 21:32:41 UX-BLUEROOM sm-mta[7263]: STARTTLS=client, relay=gmail-smtp-msa.l.google.com., version=TLSv1/SSLv3, verify=FAIL, cipher=ECDHE-RSA-RC4-SHA, bits=128/128 May 26 21:32:42 UX-BLUEROOM sm-mta[7263]: s4R0WdYN007263: to=<######@gmail.com>, ctladdr=<[email protected]> (1000/1000), delay=00:00:02, xdelay=00:00:02, mailer=relay, pri=30345, relay=gmail-smtp-msa.l.google.com. [173.194.75.109], dsn=2.0.0, stat=Sent (OK 1401150762 ek1sm23505399vdc.28 - gsmtp) May 26 21:32:42 UX-BLUEROOM sendmail[7262]: s4R0Wdxq007262: to=#####@gmail.com, ctladdr=christian (1000/1000), delay=00:00:03, xdelay=00:00:03, mailer=relay, pri=30105, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (s4R0WdYN007263 Message accepted for delivery)

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• Create a special folder within an outlook PST file

  - by Tony Dallimore

  Original question I have two problems caused by missing special folders. I added a second email address for which Outlook created a new PST file with an Inbox to which emails are successfully imported. But there is no Deleted Items folder. If I attempt to delete an unwanted email it is struck out. If move an email to a different PST file it is copied. I created a new PST file using Data File Management. This PST file has no Drafts folder. This is not important but I fail to see why I cannot have Drafts folder if I want. Any suggestions for solving these problems, particularly the first, gratefully received. Update Thanks to Ramhound and Dave Rook for their helpful responses to my original question. I assumed the problem of not have a Drafts folder in an Archive PST file and not having a Deleted Items folder associated with an Inbox were part of the same problem or I would not have mentioned the Drafts folder issue since I have an easy work-around. Perhaps my question should have been: How to I load emails from an IMAP account and be able to delete the spam?

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• NOQUEUE: SYSERR(root): opendaemonsocket: daemon MTA-v4: cannot bind: Address already in use

  - by Francesco

  I have an issue with sendmail on my server (ubuntu 12.10) with php, mysql,and wordpress installed. Basically I want to create a contact form in my blog to receive emails from visitors directly into my gmail account but it doest work! I created a php file called testmail.php to recall it from the browser: <?php $to = '[email protected]'; $subbject = 'TEST MAIL'; $msg = 'test test test test test test test test test test test test test test test'; $isMailed = mail($to, $subbject, $msg, 'From:me <[email protected]>'); if($isMailed) echo 'mail has been send to: ' . $to; else echo 'mail has NOT been send..'; ?> But I dont receive anything! The /var/log/mail.log says: NOQUEUE: SYSERR(root): opendaemonsocket: daemon MTA-v4: cannot bind: Address already in use What do i do wrong? Where do I need to check? What info do you need more? I checked also into the spam folder, nothing. Thank you!

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• Bounce backs from web-generated e-mails are missing

  - by JerSchneid

  We use Google Apps to host my company's mail. On our website, we send some e-mails on behalf of our users. In those e-mails we include lines like this: Return-Path: <[email protected]> Sender: <[email protected]> Sending the messages works great (passes SPF tests), but in the case that the message is sent TO an invalid e-mail address, we expect to get a bounce back message sent to "[email protected]". That message never arrives. (If we send an e-mail manually from within the gmail interface to the same bad e-mail, the message does arrive). We used to receive the bounce back messages as expected, but it seems like they are always quietly blocked now (not in spam or anything). Is there a new policy that blocks bounce backs when the "From" does not match the "Return-Path" or something? We would really like to get these bounce-backs to verify the delivery of the messages. Is there any way to prevent them from being blocked?! Thank you!

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• GnuPG Command Line - Verifying KeePass Signature

  - by Stisfa

  I'm trying to verify the PGP Signature of the latest version of KeePass 2.14's setup file against this signature, but this is the output I receive: C:\Program Files (x86)\GNU\GnuPG>gpg.exe --verify C:\Users\User\Desktop\KeePass-2.14-Setup.exe gpg: no valid OpenPGP data found. gpg: the signature could not be verified. Please remember that the signature file (.sig or .asc) should be the first file given on the command line. C:\Program Files (x86)\GNU\GnuPG> I found this command here, but it made no mention about ".sig" or ".asc" files, so I figured I did something wrong. By reading (http://www.gnupg.org/documentation/manuals/gnupg/gpgv.html#gpgv), I further tried the following: C:\Program Files (x86)\GNU\GnuPG>gpg.exe --pgpfile C:\Users\User\Desktop\KeePass-2.14-Setup.exe gpg: Invalid option "--pgpfile" C:\Program Files (x86)\GNU\GnuPG> As you can see, the results are quite obfuscating... I took a look at this on SuperUser (http://superuser.com/questions/16160/short-easy-to-understand-explanation-of-gpg-pgp-for-nontechnical-people - I couldn't use "a href" due to the built in spam filter that discriminates against users with < 10 rep; this is the same reason for the link above this link), but none of the links seemed to really address my question, at least not directly enough for me to get any idea on how to move forward on this. Can anybody here help me with the esoteric technicality of OpenPGP & the associated use of the GnuPG program? I've felt pretty dumb learning VBS, but this is beyond humiliating: it's absolutely debilitating and maiming whatever confidence I had with my IT skills (then again, I have no justification for making any boast either, as I have yet to get my A+ Cert, lol).

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• Getting started with webserver clustering.

  - by Ernie

  I work for a small ISP, and we host about 250 domains and all the stuff that goes along with that: DNS, mail, spam filtering, and backups. Currently, we have separate DNS servers (two of them) and mail servers (outgoing mail is actually on the secondary DNS server, but was previously on its own server). In the past, this was done as an insurance measure. The last thing we need is for some doofus (usually yours truly) to hose a server, taking out DNS and mail right along with it, or for spammers to jam our incoming SMTP server, preventing outgoing mail from being sent too. In the past, this was a problem, and our servers were set up the way they are now to combat it. However, clustering solutions like Sun's Cobalt RAQ (in days of olde) and Virtualmin appear to cater to an all-in-one approach, then deal with failures through redundant servers. I have avoided this thus far, but we've been using Virtualmin on our web server for a while now, and I'd like to expand into using it for a high availability cluster. Our networking partner has recently built a datacenter that has eliminated all of our other bugaboos like network, cooling, and power issues, so now the only thing left to go wrong is me hosing a server, which happened earlier this month. One of the bigger reasons we've avoided going this route is because our hardware requirements aren't particularly high. One server easily handles all the sites we host (most of them are flat sites). Also, load-balancing routers tend to be expensive and complicated. All that I'm really expecting to do is building a two-node cluster for redundancy so that when I hose a server (however rare that might be), we're not out for 8-12 hours while I rebuild it. What I need to know is how to get started, and if I'm really in a position to bother with this kind of thing at all.

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• What are the disadvantages of domain email forwarding?

  - by naivedeveloper

  I have a domain, example.com. My domain registrar gives me two options concerning email. Set up forwarding email addresses (e.g., [email protected] forwarded to [email protected]. Set up Google Apps for email management Thus far, I have gone with option 1. I have a generic GMail email, [email protected], and I subsequently set up various email addresses on my registrar to forward to this gmail address: [email protected] -> [email protected] [email protected] -> [email protected] [email protected] -> [email protected] Through the GMail account, I have the option to alias these addresses when sending email. For example, from [email protected], I can "send email as" [email protected]. That way from the vantage point of the receiver of the email, the email came from [email protected] as opposed to [email protected]. My question is: Are there any disadvantages of this approach? Are these emails more susceptible to being picked up by spam filters vs using the Google Apps approach? Is there any hidden indication that the email is being aliased? When viewing the email headers, it shows the email was sent from [email protected] and not [email protected] or "forwarded from [email protected]" or anything like that. Am I naive in assuming that my cheap approach to email is masked by aliasing my outgoing emails? I have chosen approach number 1 simply because of the ease of setup. With that said, are there any advantages of going with approach 2 (the Google Apps approach)? Thanks for suggestions and advice.

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• Exchange 2003: Unrestrict send mail size for specific users / groups?

  - by Kip

  Good (insert appropriate time of day here) SF folks, I have the following situation; We have a message size limit for sending set at 20mb in Global Settings | Message Delivery. We have a limit of 50mb set at an external 3rd party spam vendor. I need to enable some users to be able to send messages that are upwards of around 40mb in size. However, when I set the Sending Message Size Maximum to 50mb within the delivery restrictions of a users exchange properties, it would appear that this does not win. It seems that the lowest value wins for this situation. I need to be able to allow certain users to send messages larger than the 20mb limit, but to have everyone else have the 20mb limit in place. How can I do this? The only way I could see was to raise the limit set in Global Settings | Message Delivery to 50mb and then set everyone elses (bar the people who need increased limit) delivery restrictions max size down. But I cannot see an easy way to do the last bit hence my post here looking for advice. There are valid reasons we need to send mail this size and whilst we are putting together other mechanisms for delivery this data, we still need to get this put in place. Thanks in advance Kip

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• Postfix selective header_checks: smtpd_relay_restrictions vs. smtpd_recipient_restrictions

  - by luke

  Some of my customers implemented commercial software that violate email-RFCs such that we have had to relax our header checks. In consequence, we receive more spam. Prolog: I know the domains (customer.com) and IP-addresses (a.b.c.d/C) these emails come from Kind request for help: Is it possible to setup one Postfix (2.11) instance on Linux such that: It applies only some header checks for emails from .*@customer.com But applies all header checks for all other email sources? I thought of a combination of mynetworks that includes the subnet a.b.c.d/C in smtpd_recipient_restrictions -- allowing all these messages through -- and simultaneously avoid an open-relay with smtpd_relay_restrictions. However, this has not worked out as expected. Any idea or help is highly appreciated. Thanks in advance. Luke ==EDIT== For the current issue, I solved the problem by prepending REDIRECTs to header_checks as follows: /^received: from.*customer.com.*by mail.own.com.*for.*luke@own.*/ REDIRECT [email protected] This works so far as neeeded. Irrespective thereof, I am still looking for a postfix configuration that would turn this text-based setting into an IP-Address-Range based forwarding rule.... Thanks. Luke

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• GMail and Yahoo Mail servers not accepting mails from my slicehost slice

  - by Lakshmanan

  Hi, I have a rails in one of the slices at Slicehost. I've setup postfix (sendmail) to send emails from my rails app. All emails to Google Apps domain (to company setup google hosted paid email id) are getting delivered properly (but to spam folder). But all emails to [email protected], [email protected], .. @hotmail.com are not getting delivered and this is the line from my /var/log/mail.log Dec 21 17:33:56 staging postfix/smtp[32295]: 5EB4810545B: to=<[email protected]>, relay=j.mx.mail.yahoo.com[66.94.237.64]:25, delay=1.6, delays=0.02/0.01/1.5/0, dsn=4.0.0, status=deferred (host j.mx.mail.yahoo.com[66.94.237.64] refused to talk to me: 553 Mail from 173.203.201.186 not allowed - 5.7.1 [BL21] Connections not accepted from IP addresses on Spamhaus PBL; see http://postmaster.yahoo.com/errors/550-bl21.html [550]) and this is what i got for gmail Dec 21 17:29:17 staging postfix/smtp[32216]: 0FA3310545B: to=<[email protected]>, relay=gmail-smtp-in.l.google.com[74.125.65.27]:25, delay=0.59, delays=0.02/0.01/0.09/0.47, dsn=5.7.1, status=bounced (host gmail-smtp-in.l.google.com[74.125.65.27] said: 550-5.7.1 [173.203.201.186] The IP you're using to send mail is not authorized 550-5.7.1 to send email directly to our servers. Please use the SMTP relay at 550-5.7.1 your service provider instead. Learn more at 550 5.7.1 http://mail.google.com/support/bin/answer.py?answer=10336 v49si11176750yhc.16 (in reply to end of DATA command)) Please help. I have very little knowledge about setting dns, servers and stuff.

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