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• Preventing Email Spoofing

  - by DT

  I use Google Apps with my domain. Recently, we have begun to receive spam that gets past Google's spam filters. They are from our own email addresses. I am wondering how to prevent this kind of email spoofing. We use an SPF record with the "~all" setting. I'm wondering if I can upgrade that to "-all". However, Google Apps recommends against it. Also, I'm not 100% sure that our SPF record is complete. Any suggestions? Thank you ever so much.

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• clam anti-virus is slowing down my server performance

  - by Scarface

  Hey guys, I just installed clam av http://sourceforge.net/projects/php-clamav/ for scanning file uploads on my linux VPN running php. The problem is that for some reason just initiating the extension in the php ini file slows down my entire network. Regular requests such as changing pages that should take less than 1 second take 5. Has anyone ever experienced this before or have a good virus scanning alternative for scanning file uploads? extension=clamav.so [clamav] clamav.dbpath="/usr/share/clamav" clamav.keeptmp=20 clamav.maxreclevel=16 clamav.maxfiles=10000 clamav.maxfilesize=26214400 clamav.maxscansize=104857600 clamav.keeptmp=0

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• Anti-virus for Ubuntu Hardy 8.04

  - by April

  I am using Ubuntu hardy with Scalr and AWS, the Ubuntu instance does not come with any antivirus software. Can anyone recommend a good ant-virus software for Ubuntu? I would also need installation and config steps. Thanks.

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• clam anti-virus is slowing down my server performance significantly

  - by Scarface

  Hey guys, I just installed clam av http://sourceforge.net/projects/php-clamav/ for scanning file uploads on my linux VPN running php. The problem is that for some reason just initiating the extension in the php ini file slows down my entire network. Regular requests such as changing pages that should take less than 1 second take 5. Has anyone ever experienced this before or have a good virus scanning alternative for scanning file uploads? extension=clamav.so [clamav] clamav.dbpath="/usr/share/clamav" clamav.keeptmp=20 clamav.maxreclevel=16 clamav.maxfiles=10000 clamav.maxfilesize=26214400 clamav.maxscansize=104857600 clamav.keeptmp=0

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• Exchange 2010 forwarded emails by external servers being blocked

  - by MadBoy

  Our users were getting spam messages from their own accounts (same domain/login for example [email protected] to [email protected]). This is preety standard trick and I decided to block it so that anonymous users can't send emails as @company.com. This brought some problems on us like our printers not being able to send emails etc but I solved it with secondary smtp receiver on different port with ip restrictions. However it seems to affect forwarding by some e-mail servers as well: Hi. This is the qmail-send program at home.pl. I'm afraid I wasn't able to deliver your message to the following addresses. This is a permanent error; I've given up. Sorry it didn't work out. : 89.14.1.26 failed after I sent the message. Remote host said: 550 5.7.1 Client does not have permissions to send as this sender --- Below this line is a copy of the message. Return-Path: Return-Path: Received: from mail.company.com [89.14.1.26] (HELO mail.company.com) by company.ho.pl [79.93.31.43] with SMTP (IdeaSmtpServer v0.70) id 488fcb01c2f069d9; Tue, 3 Jan 2012 09:46:55 +0100 Received: from EXCHANGE1.COMPANY ([fe80::d425:135f:b655:1223]) by EXCHANGE2.COMPANY ([fe80::193f:51ac:9316:cb27%14]) with mapi id 14.01.0355.002; Tue, 3 Jan 2012 09:46:55 +0100 From: =?iso-8859-2?Q?MadBoy?= So basically server forwards it without affecting email address it was send with and our servers treat it like spam. I used this command to block things: Get-ReceiveConnector "DEFAULT Exchange2" | Get-ADPermission -user "NT AUTHORITY\Anonymous Logon" | where {$_.ExtendedRights -like "ms-exch-smtp-accept-authoritative-domain-sender"} | Remove-ADPermission Is there anyway I can keep on receiveing things like forwards but be able to block things (except some dedicated antispam solution - this will be added later). Also how do I "reassing" back the permissions that was removed? EDIT to clarify: I have a domain domain.com configured as Authorative. Couple of our users are on project for differentcompany.com which is not on our servers or anywhere close. Now when they send an email from their accounts lets say [email protected] to [email protected] that special alias is configured so that any email it receives it forwards to multiple people including a group alias at our domain [email protected] and that group alias puts the email in users mailboxes. After the email is forwarded by [email protected] and it reaches our server it is denied because the forwarding done by the "external" server doesn't affect user information so for the server it seems like the [email protected] was actually sender and it treats it as spam and denies it. The server at differentcompany.com just adds itself to the header that it passed thru it and doesn't modify sender at anyway (seems like this is how forwarding works). Although I could probably allow this particular server as allowed to relay but this would seem to affect more servers/users as anyone can setup forwarding on their email back to our domain...

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• Anti-virus for Ubuntu Hardy 8.04

  - by April

  I am using Ubuntu hardy with Scalr and AWS, the Ubuntu instance does not come with any antivirus software. Can anyone recommend a good ant-virus software for Ubuntu? I would also need installation and config steps. Thanks.

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• anti-virus / malware solution for small non-profit network

  - by Jason

  I'm an IT volunteer at a local non-profit. I'm looking for a good AV/malware solution. We currently use a mishmash of different client solutions, and want to move to something centralized. There is no full time IT staff. What I'm looking for: centralized administration - server is Windows Server 2003 minimal admin overhead ability to do e-mail notification/alerts/reporting would be very cool 10-25 XP Clients (P3/P4 hardware) free or discounted solution for non-profits We can get a cheap license for Symantec Endpoint Protection. My past experience with Symantec has been bad, but I've heard good things about this product. However, I've also read that it's kind of a nightmare to setup and administer, and may not be worth it for the size of our network.

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• Anti Virus automatic update problem with linux squid proxy

  - by Kumar P

  I am using RHEL 5 linux server with 10 Windows XP client machines, I installed bit defender internet security 2009 in my windows machines, My Problem is automatic updates are not performing, I get following error I can't find what i want to do changes in my proxy. I am using squid 2.6 stable When i use Norton , get same error. What i want to do, for update it ?

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• Choosing a Good Antivirus for Mac OS X

  - by waiwai933

  So I've seen some posts on what free anti-virus software is available for Mac. But is there any paid anti-virus software that is better than those that are free?

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• Unable to install Kaspersky anti virus 2011 on XP

  - by Guruprasad

  I recently tried installing Kaspersky antivirus 2011 on my XP (service pack 2) . Everytime I try to install through setup file, it initiates and then I get a pop up message saying Windows XP not compatible ( Sorry could no get the complete error message ) there is also options which come up saying "continue anyway" but it wont allow to click as the system gets hung . I also tried to skip from incompatible software by following the instructions on Kaspersky's website by creating a short cut to setup file and modifying the target field in it but still I get the same message. It also asks me to reboot before I install but it is still the same . Does this mean that I wont be able to install this antivirus software on my machine ? I also wrote to the Kaspersky support but seems they will take ages to reply.

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• How do anti-viruses work?

  - by Phoshi

  So I was thinking about viruses recently, and wondering how exactly antiviruses keep up? Considering anybody who'd been coding for a few weeks could hack together something do do nasty, nasty things to somebody's PC, the quantity alone would make a simple list of hashes prohibitive, so how do antiviruses do it? Do they monitor process activity and have a 3 strikes rule for doing virus-like things? And if so, what's stopping it from triggering on perfectly harmless things (like me moving files around in \system32)? I did a bit of googling, but the regular places didn't particularly help, and I couldn't find a dupe here, so I thought it'd be good to ask :)

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• Forwarding Emails From Inbox Only

  - by ircmaxell

  I have a forward setup on one of our public facing email addresses to a few users outside of our system (to an external address). Seeing as it's public (printed on a website in plain text), we get TONS of spam on that account. We're being marked as a SPAM source due to the forwarding by the external system. We have pretty aggressive IMF (Intelligent Message Filtering) setup, and it works great for internal messages. The problem we're facing is that Exchange is forwarding ALL the email received on that account, and not just the messages that pass the IMF (and don't get pushed into Junk). As far as I can tell, there's no way to adjust the IMF settings for that one account. And as far as I can tell, there's no way to setup folder forwarding (inbox - external address) from Exchange. Is there something I'm missing or is there any way around these issues that I may be missing? Thanks...

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• Thunderbird: filters don't match links

  - by Gregory MOUSSAT

  I use filters to remove some undesirable messages (in addition to the intergrated spam filter). This is great to avoid tons of boring people who want to sell me tons of boring stuff. My problem is, since years (so with every Thunderbird release I ever had, even the current one which is up to date) it is unable to filter links. For example I want to delete every messages containing a link to http://xxxxx.emv3.com/xxxxxx I never managed to remove those emails. I use a filter on the body, checking if it contains emv3 but this never match. Those emails are in HTML format, and the links are displayed as a text like "Visit our website" or so. If I write a HTML email with a link, my filter works. When this is a spam, this never works. When I save the email to a text file, I open it with notepad and I see several http://xxxxx.emv3.com/xxxx Any idea why this don't work ? And how can I do ?

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• Cisco Spam Blocker, Iron Port, Lotus Domino, Integration Help

  - by NickToyota

  Hi serverfault universe, I work for a medium sized (roughly 200 user) company. We are attempting to intagrate our new Cisco Spam Video Blocker (ironport) device into our network so that it acts as an incoming filter then passes it off to our Lotus domino mail server. And also vise versa. The way our network is setup currently has an mx record pointing to our Domino mail SMTP incoming server which is currently setup to be an inbound gateway and filter (using symantec domino mail software). We want to replace the inbound gateway with the ironport. Our company has also invested in a pool of external IP addresses which I believe has been currently assigned to our web, email, servers. What would the proper course of action be to successfully integrate the device be? Mx record change? Replace the domino gateway completely with the ironport? We attempted to set the ironport device to the external IP of what our mx record is pointing to without much success. Any help on proper setup would be greatly appreciated.

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• Cisco Spam Blocker, Iron Port, Lotus Domino, Integration Help

  - by NickToyota

  Hi serverfault universe, I work for a medium sized (roughly 200 user) company. We are attempting to intagrate our new Cisco Spam Video Blocker (ironport) device into our network so that it acts as an incoming filter then passes it off to our Lotus domino mail server. And also vise versa. The way our network is setup currently has an mx record pointing to our Domino mail SMTP incoming server which is currently setup to be an inbound gateway and filter (using symantec domino mail software). We want to replace the inbound gateway with the ironport. Our company has also invested in a pool of external IP addresses which I believe has been currently assigned to our web, email, servers. What would the proper course of action be to successfully integrate the device be? Mx record change? Replace the domino gateway completely with the ironport? We attempted to set the ironport device to the external IP of what our mx record is pointing to without much success. Any help on proper setup would be greatly appreciated.

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• Exchange 2010 sends out spam.

  - by Magnus Gladh

  Hi. I have an Exchange Server 2010, that uses a smart host to send out mails. A day ago the owner of smart host contact us and told us that we send out spam. I have try different open relay test on the net and all of them come back saying that this server is secured and can not be used as relay server. But I can see in my Exchange Queue Viewer that it keeps coming in new messages. Here is an example of how it looks. Identity: mailserver\3874\13128 Subject: Olevererbart:: [email protected] Pfizer -75% now Internet Message ID: <[email protected]> From Address: <> Status: Ready Size (KB): 6 Message Source Name: DSN Source IP: 255.255.255.255 SCL: -1 Date Received: 2010-12-09 21:46:22 Expiration Time: 2010-12-11 21:46:22 Last Error: Queue ID: mailserver\3874 Recipients: [email protected] How can I secure our exchange server more, to stop this from happening? Could I have got an virus that hooks up to our exchange server and send mail throw that? As I can see the From Address is always <, is there someway that I can stop sending mails that don't have a from address that I describe? Pleas help

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• Hotmail mail delivery issue (spam)

  - by chaochito

  Hello, I am running a Postfix server in a dedicated server in a Linux environment (centOS 5.3) for a social networking web application and are experiencing deliverability issues with Hotmail (I can send mails to Gmail, Yahoo, Aol in inbox). I only send legit mails for registered users (notifications). I have SPF, DK and DKIM setup. I pass the Sender ID test when mailing to [email protected] but we have "X-Auth-Result : None" only in Hotmail headers and no X-SID-Result:Pass. We have been enrolled in their program for more than 2 weeks and normally when you apply to their Sender ID program you are supposed to have X-SID-Result:Pass and X-Auth-Result:Pass. I contacted Hotmail about the issue and they told me that my domain looks like added to Sender ID in their system this is beyond their support and asked me to contact my ISP. As you can imagine, my ISP has no clue about that either. I don't really know what could be wrong... Mails are currently filtered as spam and we would like to be able to have them landing in inbox.

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• Pyglet OpenGL drawing anti-aliasing

  - by Jared Forsyth

  I've been looking around for a way to anti-alias lines in OpenGL, but none of them seem to work... here's some example code: import pyglet from pyglet.gl import * window = pyglet.window.Window(resizable=True) @window.event def on_draw(): window.clear() pyglet.gl.glColor4f(1.0,0,0,1.0) glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) glEnable (GL_BLEND) glEnable (GL_LINE_SMOOTH); glHint (GL_LINE_SMOOTH_HINT, GL_DONT_CARE) glLineWidth (3) pyglet.graphics.draw(2, pyglet.gl.GL_LINES, ('v2i', (10, 15, 300, 305)) ) pyglet.app.run() Can anyone see what I am doing wrong?

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• 5.5.0 smtp;554 transaction failed spam message not queued

  - by Miguel

  Some users are trying to send email to certain domains using Exchange Server 2003, but the message is always is rejected and the following message is shown: 5.5.0 smtp;554 Transaction Failed Spam Message not queued The IP is not in a black list (checked using http://whatismyipaddress.com/blacklist-check and is clean - not listed). The emails were checked using using smtpdiag ("a troubleshooting tool designed to work directly on a Windows server with IIS/SMTP service enabled or with Exchange Server installed") and the connection using port 25 is ok. Also, an nslookup with set type=ptr shows (names and IP changed, "" means I typed something): C:\Documents and Settings\administrator>nslookup Default Server: publicdns.isp.net Address: 10.10.10.10 > server publicdns.isp.net Default Server: publicdns.isp.net Address: 10.10.10.10 > set type=ptr >mydomain.com Server: publicdns.isp.net Address: 10.10.10.10 mydomain.com primary name server = publicdns.isp.net responsible mail addr = root.isp.net serial = 2011061301 refresh = 10800 (3 hours) retry = 3600 (1 hour) expire = 604800 (7 days) default TTL = 86400 (1 day) > 20.21.22.23 Server: publicdns.isp.net Address: 10.10.10.10 23.22.21.20.in-addr.arpa name = mail.mydomain.com 20.21.in-addr.arpa nameserver = publicdns.isp.net 20.21.in-addr.arpa nameserver = publicdns2.isp.net publicdns2.isp.net internet address = 10.10.10.11 publicdns.isp.net internet address = 10.10.10.10 Server: publicdns.isp.net Address: 10.10.10.10 23.22.21.20.in-addr.arpa name = mail.mydomain.com 20.21.in-addr.arpa nameserver = publicdns.isp.net 20.21.in-addr.arpa nameserver = publicdns2.isp.net publicdns2.isp.net internet address = 10.10.10.11 publicdns.isp.net internet address = 10.10.10.10 > set type=mx > mydomain.com Server: publicdns.isp.net Address: 10.10.10.10 mydomain.com MX preference = 10, mail exchanger = mail.mydomain.com mydomain.com nameserver = publicdns.isp.net mydomain.com nameserver = publicdns2.isp.net mail.mydomain.com internet address = 20.21.22.23 publicdns2.isp.net internet address = 10.10.10.11 publicdns.isp.net internet address = 10.10.10.10 > set type=a > mydomain.com Server: publicdns.isp.net Address: 10.10.10.10 Nombre: mydomain.com Address: 20.21.22.23 When I test the spf record with http://www.mxtoolbox.com it shows: TXT mydomain.com 24 hrs v=spf1 a mx ptr ip4:20.21.22.23 mx:mail.mydomain.com -all Any clues of what's happening here?

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• My mail going on spam from SMTP server

  - by user1767434

  I am trying to send a registration confirmation mail from my site to user who are registering from my site. my code is:- $drg_name = addslashes(trim($_POST['drg_name'])); $drg_surname = addslashes(trim($_POST['drg_surname'])); $drg_email = addslashes(trim($_POST['drg_email'])); $drg_username = addslashes(trim($_POST['drg_username'])); $drg_pass = addslashes(base64_encode($_POST['drg_pass'])); $drg_addr1 = addslashes(trim($_POST['drg_addr1'])); $drg_addr2 = addslashes(trim($_POST['drg_addr2'])); $drg_addr3 = addslashes(trim($_POST['drg_addr3'])); $drg_town = addslashes(trim($_POST['drg_town'])); $drg_county = addslashes(trim($_POST['drg_county'])); $drg_zip = addslashes(trim($_POST['drg_zip'])); $drg_country = addslashes(trim($_POST['drg_country'])); $drg_phone = addslashes(trim($_POST['drg_phone'])); $drg_gender = addslashes(trim($_POST['drg_gender'])); $drg_pstatus = addslashes(trim($_POST['drg_pstatus'])); $drg_dod = addslashes(trim($_POST['drg_dod'])); $drg_dom = addslashes(trim($_POST['drg_dom'])); $drg_doy = addslashes(trim($_POST['drg_doy'])); $drg_dob=$drg_dod.'/'.$drg_dom.'/'.$drg_doy; $drg_question = addslashes(trim($_POST['drg_question'])); $drg_answer = addslashes(trim($_POST['drg_answer'])); //send confirmation email to user to activate his/her acc $encoded_usr_id=base64_encode($usr_id); $en_id=base64_encode($insert_id); $subject = "Confirmation From dragonsnet.biz" ; $message = "Thank you to register with dragonsnet.biz<br>\n In order to >activate your account please click here: http://My SITE URL/registration_success.php?envar=".$encoded_usr_id."&euid=".$en_id."' Activate\n Thank you for taking the time to register to the dragonsnet.biz Website. "; $this->_globalObj->send_email('support@ MY-Site', $drg_email, $subject, $message, 'Site Name'); $cnf=base64_encode("confirmation"); die($this->_globalObj->redirect("registration_confirmation.php?eml=$cnf")); } my mail is going in user mail ID but in Spam not in inbox. Please help Thanks In Advance.

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• Securing smtp with login

  - by Paul Peelen

  I have a ispconfig server, and it seems that someone is using it to send spam. I got about 130 "Mail Delivery System" email about declined send email. This spammer uses my email address as sent from adress, so I get all these email adresses to my mail. I am using Postfix and Courier. I installed my server according to this guide: http://www.howtoforge.com/perfect-server-debian-lenny-ispconfig3-p3 I did this a few months ago. My question: Can I secure my server to require login to be able to send email, and if so... how? Thanks! EDIT Some data from mail.log, these kind of error show up constantly: Jun 15 17:58:16 bolt postfix/qmgr[10712]: CC7DA1242AE: from=<paul@*****.se>, size=3782, nrcpt=1 (queue active) Jun 15 17:58:16 bolt postfix/smtp[11337]: CC7DA1242AE: to=<[email protected]>, relay=none, delay=4641, delays=4640/0.01/0.32/0, dsn=4.4.3, status=deferred (Host or domain name not found. Name service error for name=cmlisboa.pt type=MX: Host not found, try again) Jun 15 17:58:19 bolt postfix/smtpd[10836]: connect from static-200-105-220-154.acelerate.net[200.105.220.154] Jun 15 17:58:20 bolt postfix/smtpd[10836]: NOQUEUE: reject: RCPT from static-200-105-220-154.acelerate.net[200.105.220.154]: 550 5.1.1 <advertising@*****.com>: Recipient address rejected: User unknown in virtual mailbox table; from=<[email protected]> to=<advertising@*****.com> proto=ESMTP helo=<static-200-105-220-154.acelerate.net> Jun 15 17:58:20 bolt postfix/smtpd[10836]: lost connection after DATA (0 bytes) from static-200-105-220-154.acelerate.net[200.105.220.154] Jun 15 17:58:20 bolt postfix/smtpd[10836]: disconnect from static-200-105-220-154.acelerate.net[200.105.220.154] Jun 15 17:58:29 bolt postfix/smtpd[10834]: connect from unknown[62.176.172.226] Jun 15 17:58:32 bolt postfix/smtpd[10834]: 386791241F9: client=unknown[62.176.172.226] Jun 15 17:58:34 bolt postfix/cleanup[10975]: 386791241F9: message-id=<[email protected]> Jun 15 17:58:34 bolt postfix/qmgr[10712]: 386791241F9: from=<[email protected]>, size=867, nrcpt=1 (queue active) Jun 15 17:58:35 bolt postfix/smtpd[10834]: disconnect from unknown[62.176.172.226] Jun 15 17:58:35 bolt amavis[11084]: (11084-17) Blocked SPAM, [62.176.172.226] [62.176.172.226] <[email protected]> -> <*****@*****>, Message-ID: <[email protected]>, mail_id: XczovKoMBYNr, Hits: 18.471, size: 867, 833 ms Jun 15 17:58:35 bolt postfix/smtp[10732]: 386791241F9: to=<*****@*****>, relay=127.0.0.1[127.0.0.1]:10024, delay=3.5, delays=2.7/0/0/0.83, dsn=2.7.0, status=sent (250 2.7.0 Ok, discarded, id=11084-17 - SPAM) Jun 15 17:58:35 bolt postfix/qmgr[10712]: 386791241F9: removed Jun 15 17:58:43 bolt postfix/smtpd[10836]: warning: 178.121.154.194: address not listed for hostname mm-194-154-121-178.dynamic.pppoe.mgts.by Jun 15 17:58:43 bolt postfix/smtpd[10836]: connect from unknown[178.121.154.194] Jun 15 17:58:45 bolt postfix/smtpd[10727]: connect from unknown[180.134.223.86] EDIT #2 Got some more info from the logs, this is a send request: mail.info.1:Jun 15 16:41:57 bolt amavis[5399]: (05399-06) Passed CLEAN, [110.139.48.64] [110.139.48.64] <paul@*****.se> -> <[email protected]>, Message-ID: <CHILKAT-MID-7c54ebcf-5501-de9b-f0b1-4f0234290d8d@HP-IRISH>, mail_id: 35l56Ramx6Nc, Hits: -2.941, size: 3329, queued_as: 2485770086, 136 ms mail.info.1:Jun 15 16:41:57 bolt postfix/smtp[4743]: 375C570082: to=<[email protected]>, relay=127.0.0.1[127.0.0.1]:10024, delay=4.8, delays=4.7/0/0/0.14, dsn=2.0.0, status=sent (250 2.0.0 Ok, id=05399-06, from MTA([127.0.0.1]:10025): 250 2.0.0 Ok: queued as 2485770086) Which apparently got thrue. Any ideas how to restrict this?

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• Email sent from Centos end up in user spam folder

  - by oObe

  I am facing this issue, I use the default postfix MTA in centos but the mail end up in user spam folder, but this does not seem to be a problem in Debian using exim4, both host have hostname and domain name configured, and relay mail through external smtp host. Both configuration and recieving email header are attached. The different seems that Debian has this additional (envelope tag) and (from) tag other than some minor syntax differences. Any help to resolve is appreciated. The IP address and DNS is masked as follow: 1.2.3.4 = My IP address smtp.host.com = external smtp host for my company [email protected] = account at smtp host centos.abc.com = Local centos server debian.abc.com = Local debian server Thanks. Centos main.cf config with the following params configured myhostname = centos.abc.com mydomain = abc.com myorigin = centos.abc.com relayhost = smtp.host.com Centos - User receiving mail header Return-Path: <[email protected]> Received: from 1.2.3.4 [1.2.3.4] by smtp.host.com with SMTP; Thu, 27 Sep 2012 13:36:49 +0800 Received: by centos.abc.com (Postfix, from userid 0) id 1E0637B89; Fri, 28 Sep 2012 13:36:39 +0800 (SGT) Return-Path: <[email protected]> Received: from 1.2.3.4 [1.2.3.4] by smtp.host.com with SMTP; Thu, 27 Sep 2012 13:36:49 +0800 Received: by centos.abc.com (Postfix, from userid 0) id 1E0637B89; Fri, 28 Sep 2012 13:36:39 +0800 (SGT) Date: Fri, 28 Sep 2012 13:36:39 +0800 To: [email protected] Subject: Test mail from centos User-Agent: Heirloom mailx 12.4 7/29/08 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-Id: <[email protected]> From: [email protected] (root) X-SmarterMail-TotalSpamWeight: 0 X-Antivirus: avast! (VPS 120926-1, 27/09/2012), Inbound message X-Antivirus-Status: Clean http://i.imgur.com/7WAYX.jpg Debain exim4 config .... # This is a Debian specific file dc_eximconfig_configtype='smarthost' dc_other_hostnames='debian.abc.com' dc_local_interfaces='127.0.0.1 ; ::1' dc_readhost='debian.abc.com' dc_relay_domains='smtp.host.com' dc_minimaldns='false' dc_relay_nets='127.0.0.1' dc_smarthost='smtp.host.com' CFILEMODE='644' dc_use_split_config='false' dc_hide_mailname='true' dc_mailname_in_oh='true' dc_localdelivery='mail_spool' debian - User receiving mail header Return-Path: <[email protected]> Received: from 1.2.3.4 [1.2.3.4] by smtp.host.com with SMTP; Thu, 27 Sep 2012 15:02:53 +0800 Received: from root by debian.abc.com with local (Exim 4.72) (envelope-from <[email protected]>) id 1TH86d-00010v-G9 for [email protected]; Thu, 27 Sep 2012 15:01:55 +0800 Return-Path: <[email protected]> Received: from 1.2.3.4 [1.2.3.4] by smtp.host.com with SMTP; Thu, 27 Sep 2012 15:02:53 +0800 Received: from root by debian.abc.com with local (Exim 4.72) (envelope-from <[email protected]>) id 1TH86d-00010v-G9 for [email protected]; Thu, 27 Sep 2012 15:01:55 +0800 Date: Thu, 27 Sep 2012 15:01:55 +0800 Message-Id: <[email protected]> To: [email protected] Subject: Test from debian From: root <[email protected]> X-SmarterMail-TotalSpamWeight: 0 X-Antivirus: avast! (VPS 120926-1, 27/09/2012), Inbound message X-Antivirus-Status: Clean http://imgur.com/nMsMA.jpg

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• HMTL5 Anti Aliasing Browser Disable

  - by Tappa Tappa

  I am forced to consider writing a library to handle the fundamental basics of drawing lines, thick lines, circles, squares etc. of an HTML5 canvas because I can't disable a feature embedded in the browser rendering of the core canvas algorithms. Am I forced to build the HTML5 Canvas rendering process from the ground up? If I am, who's in with me to do this? Who wants to change the world? Imagine a simple drawing application written in HTML5... you draw a shape... a closed shape like a rudimentary circle, free hand, more like an onion than a circle (well, that's what mine would look like!)... then imagine selecting a paint bucket icon and clicking inside that shape you drew and expecting it to be filled with a color of your choice. Imagine your surprise as you selected "Paint Bucket" and clicked in the middle of your shape and it filled your shape with color... BUT, not quite... HANG ON... this isn't right!!! On the inside of the edge of the shape you drew is a blur between the background color and your fill color and the edge color... the fill seems to be flawed. You wanted a straight forward "Paint Bucket" / "Fill"... you wanted to draw a shape and then fill it with a color... no fuss.... fill the whole damned inside of your shape with the color you choose. Your web browser has decided that when you draw the lines to define your shape they will be anti-aliased. If you draw a black line for your shape... well, the browser will draw grey pixels along the edges, in places... to make it look like a "better" line. Yeah, a "better" line that **s up the paint / flood fill process. How much does is cost to pay off the browser developers to expose a property to disable their anti-aliasing rendering? Disabling would save milliseconds for their rendering engine, surely! Bah, I really don't want to have to build my own canvas rendering engine using Bresenham line rendering algorithm... WHAT CAN BE DONE... HOW CAN THIS BE CHANGED!!!??? Do I need to start a petition aimed at the WC3???? Will you include your name if you are interested??? UPDATED function DrawLine(objContext, FromX, FromY, ToX, ToY) { var dx = Math.abs(ToX - FromX); var dy = Math.abs(ToY - FromY); var sx = (FromX < ToX) ? 1 : -1; var sy = (FromY < ToY) ? 1 : -1; var err = dx - dy; var CurX, CurY; CurX = FromX; CurY = FromY; while (true) { objContext.fillRect(CurX, CurY, objContext.lineWidth, objContext.lineWidth); if ((CurX == ToX) && (CurY == ToY)) break; var e2 = 2 * err; if (e2 > -dy) { err -= dy; CurX += sx; } if (e2 < dx) { err += dx; CurY += sy; } } }

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• Preventing spam bots on site?

  - by Mike

  We're having an issue on one of our fairly large websites with spam bots. It appears the bots are creating user accounts and then posting journal entries which lead to various spam links. It appears they are bypassing our captcha somehow -- either it's been cracked or they're using another method to create accounts. We're looking to do email activation for the accounts, but we're about a week away from implementing such changes (due to busy schedules). However, I don't feel like this will be enough if they're using an SQL exploit somewhere on the site and doing the whole cross site scripting thing. So my question to you: If they are using some kind of XSS exploit, how can I find it? I'm securing statements where I can but, again, its a fairly large site and it'd take me awhile to actively clean up SQL statements to prevent XSS. Can you recommend anything to help our situation?

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• Postfix Whitelist before recipient restrictions

  - by GruffTech

  Alright. Some background. We have an anti-spam cluster trucking about 2-3 million emails per day, blocking somewhere in the range of 99% of spam email from our end users. The underlying SMTP server is Postfix 2.2.10. The "Frontline defense" before mail gets carted off to SpamAssassin/ClamAV/ ect ect, is attached below. ...basic config.... smtpd_recipient_restrictions = reject_unauth_destination, reject_rbl_client b.barracudacentral.org, reject_rbl_client cbl.abuseat.org, reject_rbl_client bl.mailspike.net, check_policy_service unix:postgrey/socket ...more basic config.... As you can see, standard RBL services from various companies, as well as a Postgrey service. The problem is, I have one client (out of thousands) who is very upset that we blocked an important email of theirs. It was sent through a russian freemailer who was currently blocked in two of our three RBL servers. I explained the situation to them, however they are insisting we do not block any of their emails. So i need a method of whitelisting ANY email that comes to domain.com, however i need it to take place before any of the recipient restrictions, they want no RBL or postgrey blocking at all. I've done a bit of research myself, http://www.howtoforge.com/how-to-whitelist-hosts-ip-addresses-in-postfix seemed to be a good guide at first, almost fixing my problem, But i want it to accept based on TO address, not originating server.

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