Problem
I have a Gitlab Omnibus edition installed on a DigitalOcean server. I find that when I create a new user account with a gmail ID, they never receive any email from Gitlab.
Poking through the mail.log file:
Jun 2 00:02:34 hostname postfix/pickup[13969]: D5FB82001C: uid=999 from= Jun 2 00:02:34 hostname postfix/cleanup[18636]: D5FB82001C: message-id= Jun 2 00:02:34 hostname postfix/qmgr[14920]: D5FB82001C: from=, size=5478, nrcpt=1 (queue active) Jun 2 00:02:34 hostname postfix/smtp[18640]: connect to gmail-smtp-in.l.google.com[2404:6800:4003:c01::1a]:25: Network is unreachable Jun 2 00:02:37 hostname postfix/smtp[18640]: D5FB82001C: to=, relay=gmail-smtp-in.l.google.com[74.125.200.26]:25, delay=2.2, delays=0.01/0.01/0.86/1.3, dsn=2.0.0, status=sent (250 2.0.0 OK 1433217891 j15si24377385pdk.208 - gsmtp) Jun 2 00:02:37 hostname postfix/qmgr[14920]: D5FB82001C: removed
The relevant error seems to be:
connect to gmail-smtp-in.l.google.com[2404:6800:4003:c01::1a]:25: Network is unreachable
Which is strange, because I can send mail to gmail just fine via the command line.
Mail Server
My mail is setup on this server using postfix/dovecot/Squirrelmail. I'm afraid I don't understand too much about how this works, I pretty much just followed a bunch of tutorials to duct-tape it together, and haven't quite understood it yet.
Stuff that works
I've verified that the following two scenarios work:
- Send mail to gmail ID from command line works fine:
echo -e "Hello there" | mail -s "Test Email" "random@gmail.com"
Mail.log entries for this action:
Jun 2 00:23:46 hostname postfix/pickup[13969]: 853432001C: uid=1000 from=<vidur@hostname>
Jun 2 00:23:46 hostname postfix/cleanup[23752]: 853432001C: message-id=<20150602042346.853432001C@mail.hostname.com>
Jun 2 00:23:46 hostname postfix/qmgr[14920]: 853432001C: from=<vidur@hostname>, size=356, nrcpt=1 (queue active)
Jun 2 00:23:48 hostname postfix/smtp[23754]: 853432001C: to=<random@gmail.com>, relay=gmail-smtp-in.l.google.com[74.125.200.27]:25, delay=1.7, delays=0.01/0/0.85/0.88, dsn=2.0.0, status=sent (250 2.0.0 OK 1433219162 fw3si24157505pbb.133 - gsmtp)
Jun 2 00:23:48 hostname postfix/qmgr[14920]: 853432001C: removed
- Send mail via Gitlab to random other domain - tested with Guerrilla Mail
Jun 2 00:31:20 hostname postfix/pickup[24015]: B66B92001C: uid=999 from= Jun 2 00:31:20 hostname postfix/cleanup[24228]: B66B92001C: message-id= Jun 2 00:31:20 hostname postfix/qmgr[14920]: B66B92001C: from=, size=5813, nrcpt=1 (queue active) Jun 2 00:31:22 hostname postfix/smtp[24232]: B66B92001C: to=, relay=mail.sharklasers.com[198.143.169.10]:25, delay=1.7, delays=0.02/0/0.65/1.1, dsn=2.0.0, status=sent (250 OK : queued as a99f431dc4f7f2b50ad3980311a1d4a6) Jun 2 00:31:22 hostname postfix/qmgr[14920]: B66B92001C: removed
I'm open to any ideas and suggestions. Do let me know if I can provide more information to help debug this problem. Thanks.