Question

25 socket error from GMail (postfix, dovecot, ubuntu 14.04)

I’m getting the following error when trying to send mail to a mail server I’ve set up:

The recipient server did not accept our requests to connect. Learn more at http://support.google.com/mail/bin/answer.py?answer=7720
[(10) mail.mydomain.com. [123.456.789.123]:25: socket error]

My MX records check out when I put them through mxtoolbox.com. However, I can’t seem to get through via SMTP despite the following UFW status:

Status: active

To                         Action      From
--                         ------      ----
22                         ALLOW       Anywhere
9999/tcp                   ALLOW       Anywhere
80/tcp                     ALLOW       Anywhere
Anywhere                   ALLOW       24.62.28.170
443/tcp                    ALLOW       Anywhere
25/tcp                     ALLOW       Anywhere
993/tcp                    ALLOW       Anywhere
587/tcp                    ALLOW       Anywhere
465/tcp                    ALLOW       Anywhere
22 (v6)                    ALLOW       Anywhere (v6)
9999/tcp (v6)              ALLOW       Anywhere (v6)
80/tcp (v6)                ALLOW       Anywhere (v6)
443/tcp (v6)               ALLOW       Anywhere (v6)
25/tcp (v6)                ALLOW       Anywhere (v6)
993/tcp (v6)               ALLOW       Anywhere (v6)
587/tcp (v6)               ALLOW       Anywhere (v6)
465/tcp (v6)               ALLOW       Anywhere (v6)

I’ve followed the ARS guide for setting up a mail server with the exception of the DKIM setup which I did via port rather than user (it seems to be working just fine).

Outgoing mail sends just fine and does not get caught in spam filters. I remember when I initially set up the server I did some kind of mail configuring to send Tripwire reports and I’m wondering if that’s messing everything up.

Barring suggestions here, I’m thinking I might take a mulligan and try again.


Submit an answer

This textbox defaults to using Markdown to format your answer.

You can type !ref in this text area to quickly search our full set of tutorials, documentation & marketplace offerings and insert the link!

Sign In or Sign Up to Answer

These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.

Want to learn more? Join the DigitalOcean Community!

Join our DigitalOcean community of over a million developers for free! Get help and share knowledge in Q&A, subscribe to topics of interest, and get courses and tools that will help you grow as a developer and scale your project or business.

I’m not able to reach port 25 on your Droplet. Do you have a mail server running and listening on 0.0.0.0:25? Please post the output of the following command:

sudo netstat -plutn | grep 25