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unom
Asked: 2012-11-13 03:09:36 +0800 CST

Server is able to receive mail, but mail it sends never get to destination?

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I have a OS X Server behind a router. Server's ip address is 10.0.1.3. The router has open ports on everything and an external ip.

I've setup my mail exchange. I can receive mail people send to me but the reply never gets back to them.

I don't use TXT records, could that be the problem? Could my ISP be blocking something?

mx-record

1 Answers

    • Check your FCrDNS to ensure you aren't getting binned as spam. You should also confirm how your server identifies itself to the outside world by telnetting to port 25 on your server and checking the banner.

    • Further to spam issues, run your IP through MultiRBL

    • Ensure you can telnet from your server to a known-good remote mailserver on port 25 (e.g. gmail-smtp-in.l.google.com).

    • What do your mail logs say? These should be in /var/log/maillog (or mail.log).

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