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• PTR Record Troubles

  - by Physikal

  I am having a hell of a time getting our PTR record right. Our current PTR zone looks like this: $ttl 38400 @ IN SOA ns1.domain.com. admin.domain.com. ( 1268669139 10800 3600 604800 38400 ) xxx.xxx.xxx.in-addr.arpa. IN NS ns2.domain.com. xxx.xxx.xxx.in-addr.arpa. IN NS ns1.domain.com. 97 IN PTR mail.domain.com. xxx.xxx.xxx.xxx.in-addr.arpa. IN PTR mail.domain.com. 97.96/28. IN PTR mail.domain.com For some reason the only thing that works is the 97.96/28. When this line is in there it actually says I have a PTR record when reporting from intodns.com. If I remove that line, it says I have no PTR. I have followed instructions from http://www.philchen.com/2007/04/04/configuring-reverse-dns and when I follow those instructions intodns.com says I have no PTR. When it does work with the line 97.96/28., the PTR kicks back as (from intodns.com) : 97.xxx.xxx.xxx.in-addr.arpa -> mail.domain.com.xxx.xxx.xxx.in-addr.arpa Which is, to my knowledge, an incorrect PTR. I want it to just kick back as mail.domain.com, without the xxx.xxx.xxx.in-addr.arpa extension. I have tried everything I can think of but I can't fix it. I can't help but think it's one of those things that is so stupid and simple I'm going to do the ol'facepalm. Any help is greatly appreciated. Thanks! In the event that the domain zone is needed, here it is: $ttl 38400 @ IN SOA domain.com. [email protected]. ( 1265221037 10800 3600 604800 38400 ) domain.com. IN A xxx.xxx.xxx.xxx www.domain.com. IN A xxx.xxx.xxx.xxx ftp.domain.com. IN A xxx.xxx.xxx.xxx m.domain.com. IN A xxx.xxx.xxx.xxx localhost.domain.com. IN A 127.0.0.1 webmail.domain.com. IN A xxx.xxx.xxx.xxx admin.domain.com. IN A xxx.xxx.xxx.xxx mail.domain.com. IN A xxx.xxx.xxx.xxx domain.com. IN MX 5 mail.domain.com. domain.com. IN TXT "v=spf1 a mx a:domain.com ip4:xxx.xxx.xxx.xxx ?all" domain.com. IN NS ns1 domain.com. IN NS ns2 ns1 IN A xxx.xxx.xxx.xxx ns2 IN A xxx.xxx.xxx.xxx Any double entries in different formats were part of my troubleshooting process.

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• How to prevent remote hosts from delivering mail to Postfix with spoofed From header?

  - by Hongli Lai

  I have a host, let's call it foo.com, on which I'm running Postfix on Debian. Postfix is currently configured to do these things: All mail with @foo.com as recipient is handled by this Postfix server. It forwards all such mail to my Gmail account. The firewall thus allows port 25. All mail with another domain as recipient is rejected. SPF records have been set up for the foo.com domain, saying that foo.com is the sole origin of all mail from @foo.com. Applications running on foo.com can connect to localhost:25 to deliver mail, with [email protected] as sender. However I recently noticed that some spammers are able to send spam to me while passing the SPF checks. Upon further inspection, it looks like they connect to my Postfix server and then say HELO bar.com MAIL FROM:<[email protected]> <---- this! RCPT TO:<[email protected]> DATA From: "Buy Viagra" <[email protected]> <--- and this! ... How do I prevent this? I only want applications running on localhost to be able to say MAIL FROM:<[email protected]>. Here's my current config (main.cf): https://gist.github.com/1283647

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• Exim4 Smart Host Relay

  - by ColinM

  I am running Exim 4.71. I want to: Route all email from A.com through mail.A.com Route all email from [B-E].com through mail.B.com Send all other email directly. Here is the configuration I have that doesn't work like I hoped: domainlist a_domains = a.com domainlist b_domains = b.com : c.com : d.com : e.com begin routers smart_route_a: driver = manualroute domains = +a_domains transport = remote_smtp route_list = +a_domains mail.a.com no_more smart_route_b: driver = manualroute domains = +b_domains transport = remote_smtp route_list = +b_domains mail.mollenhour.com no_more dnslookup: driver = dnslookup domains = ! +local_domains transport = remote_smtp ignore_target_hosts = 0.0.0.0 : 127.0.0.0/8 no_more When I send an email e.g. with PHP's mail() or Zend_Mail_Transport_Smtp setting both From: and Return-Path: as [email protected], the smart_route_a router is not used, the dnslookup is used instead. Disabling dnslookup results in no mail being sent. From the logs it appears that email sent to [email protected] uses smart_route_a, but the same email sent from [email protected] to [email protected] is sent using dnslookup. How do I make email from [email protected] be relayed via mail.a.com?

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• Difference between BSMTP and and simply forwarding an MX-record?

  - by Aron Rotteveel

  I am trying to understand the benefits of BSMTP, but must admit I do not quite understand the concept of it. What are the main differences between BSMTP and simply forwarding an MX-record? What is the difference between BSMTP and having a fallback MX? Are there any downsides to using BSMTP? Hopefully you can clear this up for me. Thanks in advance!

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• Is null return path reliable indication of a bounce?

  - by Vasiliy Faronov

  I have a mailbox that receives bounces as well as normal email (the latter includes messages from automated services). I want to filter out the bounces and forward them to another mailbox. Assume I cannot change the envelope return path in email I send. Is “null return path” a reliable criterion to tell bounces from normal mail? Roughly how many false positives and false negatives can I expect if I apply it?

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• DKIM on postfix relay server

  - by Danijel Krmar

  I have a postfix/amavis relay server, with the domain name mail.example.com. It will be a relay for dozens of VPSs, which will have domains like hostname.example.net. So i have actually two questions. Is it possible to dkim sing the mails originating from the VPSs over the postfix relay on the relay server? Or have the mails to be signed on the VPSs where they are actually from? Would a amavis configuration like this be ok? # DKIM key dkim_key('example.com', 'dkim', '/var/dkim/DKIMkey.pem'); # Cover subdomains in @dkim_signature_options_bysender_maps= (): @dkim_signature_options_bysender_maps = ( { # Cover subdomains example.net. '.example.net' => { d => 'example.com' }, }); Or have I misunderstood the whole concept. Do I even need to sign subdomains if they are going over an relay server, or is it enough to just sign the relay server domain?

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• Postfix - Block email from non-existent local addresses

  - by Kelso.b

  My question is very similar to this one, but for postfix. We keep getting emails from addresses like "[email protected]" delivered to other "@ourdomain.com" addresses. From my google research, I understand it might not be practical to verify the email originated from our IP or VPN (Although this would be ideal, so if you can think of a way to do this, let me know), but in most of these cases the sender address (ex. "accounting") is not a valid account. I imagine there must be a way to make sure that a local account exists before delivering the message.

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• World's simplest, LIGHTEST email client?

  - by rekindleMyLoveOf

  I do not want the bloat that is outlook, nor do I need exchange server-like nifty features. Most certainly do not want the bloat that is thunderbird. I just want to be able to send and receive email as/with the particular email account I set up on my domain. Pocomail sounded like a nice idea but apparently it does not deal with html and since this is for a tiny fledgling biz, i think I might need to accomodate html... so I didn't investigate further. Too bad gmail won't let me send from my own mail server, really. :o) What do you guys use that simple and nifty? ===edit=== forgot to mention this is going to be on Windows Vista. (Hey, I'm not a "superuser", okay? I got bounced from stackoverflow :-) )

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• Capture Outgoing Email to One Mailbox or Account on Linux

  - by futureal

  I am looking to see if anything exists that would allow us to capture all outgoing email on a machine -- for example, in a staging environment -- and drop it in a single place, which ideally would be something we could check with a mail client. Currently we're doing this on the software level (if environment is staging, rewrite address) which is a bit ugly and leads to errors. The servers are currently on Debian Linux, using exim as the mail transport. Open to any and all suggestions!

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• "must issue a starttls command first" when MSSQL emails via Microsoft Online

  - by David

  I have written a stored procedure in MSSQL Server 2008 R2 which sends emails when my Application logs errors. It works fine on servers at our office but when I ran it on our remote servers I got must issue a starttls command first So maybe there is a setting somewhere which is different between the two servers, and that's why it's working on one and not the other. How do I set the server so that it issues a "starttls commaned first"?

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• Things to check for an internet-facing email server.

  - by Shtééf

  I'm faced with the task of setting up a public-internet-facing email server, that will be relaying mail for all of our other servers in the network. While the software in itself is set up in few keystrokes, what little experience I have with managing an email server has thought me that there are tons of awkward filtering techniques employed by other email systems. Systems that my own server will inevitably interact with a some point. Hence, my questions: What things should be kept in mind and double checked when setting up an email server? What resources are available for checking if my email server is set-up correctly? I'm specifically NOT looking for instructions for any given mail server, such as Exchange or Postfix. But it's okay to say: “you should have X and Y in your set-up, because when talking to server software Z, it typically tries to weed out open relays by checking for these.” Some things I've discovered myself: Make sure forward and reverse DNS are set up. Mail servers tend to do a reverse lookup for the peer IP-address when receiving. Matching a reverse look up with a follow-up forward lookup is probably employed to weed out open relays run through malware on home networks. Make sure the user in the From-address exists. The From-address is easily spoofed. A receiving mail server may try to contact the mail server in the From-domain, and see if the From-user actually exists.

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• Using AWS SES with Sendmail

  - by Abs

  I am trying to send mail via AWS SES uisng Sendmail. I have Sendmail version 8.14.4 installed and I followed the first section of this useful tutorial by Amazon. However, I get this: root@:/etc/mail# echo "Subject: test" | sendmail -v [email protected] [email protected]... Connecting to [127.0.0.1] via relay... [email protected]... Deferred: Connection timed out with [127.0.0.1] Can anyone help me get this working? The logs have the following: Dec 14 10:35:21 ip-10-xx-xx-181 sm-msp-queue[17910]: qBE8K1Lu016411: to=root, delay=00:21:24, xdelay=00:06:19, mailer=relay, pri=121806, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection timed out with [127.0.0.1]

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• Custom Transport Agent: How do I collect NDRs and all other undeliverables in Exchange 2010 from the Postmaster?

  - by makerofthings7

  I'm trying to collect all NDRs in a single mailbox for all invalid recipients, and anything that fails for any reason. I have a custom transport agent, that I've written myself that appears here: [PS] C:\Windows\system32>Get-TransportAgent Identity Enabled Priority -------- ------- -------- Transport Rule Agent True 1 Text Messaging Routing Agent True 2 Text Messaging Delivery Agent True 3 Routing Rule Agent True 4 **** Sometimes when I run get-messagetrackinglog I get failures like this below RunspaceId : 4ecc61fb-13b9-4506-b680-577222c9bf21 Timestamp : 10/14/2013 12:42:42 PM ClientIp : ClientHostname : Exchange1 ServerIp : ServerHostname : SourceContext : Routing Rule Agent ConnectorId : Source : AGENT EventId : FAIL InternalMessageId : 4416 MessageId : <[email protected]> Recipients : {[email protected]} RecipientStatus : {} TotalBytes : 4542 RecipientCount : 1 RelatedRecipientAddress : Reference : MessageSubject : review CGRC due diligence. Sender : [email protected] ReturnPath : [email protected] MessageInfo : MessageLatency : MessageLatencyType : None EventData : How can I collect the NDRs in a single mailbox for review? I have already set the following command but it is of no effect [PS] C:\>set-TransportConfig -JournalingReportNdrTo [email protected] -ExternalPostmasterAddress [email protected]

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• Colud not open connection to the host error in telnet

  - by hima

  I need to send email from my asp.net application.For that I am using telnet tk2smtp.msn.com 25 command from the command prompt to connect to the specific port on tk2smtp but its showing Could not open connection to the host error in command prompt. I installed Telnet Client in my machine . Let me know if there are any other things to be configured for this Thanks, Hima.

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• Different Servers for incoming mails

  - by André

  Hi everybody, not sure if what I want is possible so I´d appreciate any pointers. I have full control over the infrastructure (DNS and servers) Currently I receive mails for domain.tld. MX record for domain.tld is gw.domain.tld. gw then does some spam and virus checking and forwards the mails to the internal exchange server. GW is a Proxmox Mail Gateway Box (Free license) Now what I want is to distribute mails for different recipients to other mail servers. Basicly I only want [email protected] and [email protected] to go to the exchange as before, but all others go to a different mail server (based on linux). Any idea how I could achieve this?

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• Log with iptalbes which user is delivering email to port 25

  - by Maus

  Because we got blacklisted on CBL I set up the following firewall rules with iptables: #!/bin/bash iptables -A OUTPUT -d 127.0.0.1 -p tcp -m tcp --dport 25 -j ACCEPT iptables -A OUTPUT -p tcp -m tcp --dport 25 -m owner --gid-owner mail -j ACCEPT iptables -A OUTPUT -p tcp -m tcp --dport 25 -m owner --uid-owner root -j ACCEPT iptables -A OUTPUT -p tcp -m tcp --dport 25 -m owner --uid-owner Debian-exim -j ACCEPT iptables -A OUTPUT -p tcp -m limit --limit 15/minute -m tcp --dport 25 -j LOG --log-prefix "LOCAL_DROPPED_SPAM" iptables -A OUTPUT -p tcp -m tcp --dport 25 -j REJECT --reject-with icmp-port-unreachable I'm not able to connect to port 25 from localhost with another user than root or a mail group member - So it seems to work. Still some questions remain: How effective do you rate this rule-set to prevent spam coming from bad PHP-Scripts hosted on the server? Is there a way to block port 25 and 587 within the same statement? Is the usage of /usr/sbin/sendmail also limited or blocked by this rule-set? Is there a way to log the username of all other attempts which try to deliver stuff to port 25?

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• Postfix: mail going to spam

  - by Yaro

  All emails I send from my new server go to spam in Gmail (and sometimes yahoo). I've never before sent out mass email or spam. What I've already done: Configured reverse DNS Enabled DKIM Verified my IP is not on spam lists Verified I'm not an open relay Here are the headers from the received message: http://pastie.org/pastes/8450781/text?key=onxgrau1xinyqv7ridxrea Really, can't seem to figure out why the mail just doesn't come through. I'd really appreciate your help. Thank you!

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• Something is spamming from my hMail server - how can I deal with this?

  - by joshcomley

  My Windows 2008 server is attempting to send out a lot of spam, I've just discovered, and I'm not sure how to see where the compromise is. For example: has someone hacked an account? Has someone hacked the server? Is there a virus on the server? What can I do to investigate this? Edit Thanks for the replies so far. I am running hMail server, and have spent so long investigating the correct configuration but still I end up with these emails being sent. Here is a screenshot of my Internet IP range settings on the server: (let me know what else I can provide to help)

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• unknown reciever Esmtp

  - by Morteza Soltanabadiyan

  I found this in my log server: sm-mta[11410]: r9BKb6YY021119: to=<[email protected]>, ctladdr=<[email protected]> (33/33), delay=2+07:24:18, xdelay=00:00:01, mailer=esmtp, pri=29911032, relay=mail1.mkuku.com. [58.22.50.83], dsn=4.0.0, stat=Deferred: Connection refused by mail1.mkuku.com. This message is repeated every 10-30 seconds with a different "to" address. What is this? Is my server being used to send spam?

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• E-mails sent with postfix are marked as spam.

  - by unkown

  I am using gmail as my email provider, and I only have gmail servers for my mx records. I don't like the 500 message per day cap. To address this issue I would like to run postfix on my Linux machine to only send email, port 25 blocked by my firewall. I can send email, however google marks all messages sent with postfix as SPAM. How do I make sure that people know email sent with postfix is valid?

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• sendmail: Transport endpoint is not connected

  - by david

  A few days ago my mail server (fedora 10, running sendmail 8.14.3) started getting "Transport endpoint is not connected" messages in the log. It seems to be happening for bigger mail hosts (hotmail, gmail, aol, etc). The errors started happening about the same time I upgraded clamav ... so I just tried downgrading clamav to the previous version, but the error keeps happening. I was dubious anyways ... why a milter would effect sendmail's ability to connect with a remote server was beyond me. If I force the mail queue's to run, the messages are delivered normally. I had this happen once before ... and I thought it was related to a milter I had configured but wasn't using ... but that milter is not in use at all now. Any suggestions?

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• "Could not open connection to the host" error when trying to send email using telnet

  - by hima

  I need to send email from my ASP.NET application. For that I am using the following command from the command prompt to connect to the specific port on tk2smtp: telnet tk2smtp.msn.com 25 But it's showing the following error on the command prompt: Could not open connection to the host I installed a telnet client in my machine. Let me know if there are any other things to be configured for this.

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• Exchange 2010 550 5.7.1 unable to relay

  - by isorfir

  I have a website application that needs to send email via our Exchange servers. It sends email internally fine, but when sending to an external address I get the 550 5.7.1 unable to relay error. I followed this guide to create a connector to allow relay. Unfortunately, all office email was trying to use that connector and was not being routed correctly. It also appeared as though it opened it up for spammers to use. This is obviously unacceptable and a secure method is needed.

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• How to get Postfix to send/forward/relay to a sub-domain located on another server?

  - by thiesdiggity

  I have a quick question. How do I setup postfix to send an email to another server (Exchange Server) when sending to an email address that has a sub-domain of our main server. For example, say our main server is mail.example.com and we have a Exchange server setup to receive emails from exchange.example.com. We have the MX records setup in our DNS and it receives correctly if we send from a GMail account. However, when we try to send an email from a @example.com account we get the following error: Host or domain name not found. Name service error for name=exchange.example.com type=A: Host not found I believe Postfix checks for local mailboxes first and if its setup with the domain it delivers to the local account, but in this case the sub-domain accounts are located in another server. Anyone have any thoughts on what I need to do within Postfix so it doesn't look locally for the exchange.example.com mailboxes? I found relay_domains directive within Postfix but that doesn't seem to fix it when I add the sub-domain. Thanks for your help.

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• Exchange and external mail server

  - by Bahrain Admin

  Hi, We have our domain hosted externally with Network Solutions, and our mail server is running from there. We have a branch office in Bahrain and have 3 users who would like to use their email addresses on a local exchange server running at the Bahrain office. The Exchange server is currently only used for internal mail,contacts and calendaring. I've used a third=party program to download the POP3 mail to their exchange accounts. so they can receive mail from outside. The issue is in sending mail using their external addresses. I've setup their exchange accounts to include their external address. But we get an error message stating that the IP is not authorized. I tried putting the local ISP as the smart host, but then we get an error message stating that the Address was rejected. I tried using our own external mail server as the smart host, but then the message "Relaying is denied" comes up. Any suggestions? Thanks Arun

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