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I used the tutorial below to setup postfix and dovecot on a Digital Ocean server. But I'm getting "Connection Timed out" when postfix/smtp tries to deliver an email to a remote host like gmail or yahoo..

https://www.digitalocean.com/community/articles/how-to-set-up-a-postfix-e-mail-server-with-dovecot

RECEIVING A NEW MESSAGE /var/log/mail.log

Feb 2 22:33:38 localhost dovecot: auth-worker: Debug: Loading modules from directory: /usr/lib/dovecot/modules/auth

Feb 2 22:33:38 localhost dovecot: auth-worker: Debug: pam(app,189.63.49.XXX): lookup service=dovecot

Feb 2 22:33:38 localhost dovecot: auth-worker: Debug: pam(app,189.63.49.XXX): #1/1 style=1 msg=Password:

Feb 2 22:33:38 localhost dovecot: auth: Debug: client out: OK#0111#011user=app

Feb 2 22:33:40 localhost postfix/submission/smtpd[1045]: E9AA724264: client=unknown[189.63.49.XXX], sasl_method=PLAIN, sasl_username=app

Feb 2 22:33:43 localhost postfix/cleanup[1052]: E9AA724264: message-id=

Feb 2 22:33:43 localhost postfix/qmgr[32661]: E9AA724264: from=, size=485, nrcpt=1 (queue active)

Feb 2 22:33:45 localhost postfix/submission/smtpd[1045]: disconnect from unknown[189.63.49.XXX]

Feb 2 22:34:14 localhost postfix/smtp[1053]: connect to mta5.am0.yahoodns.net[98.136.216.25]:25: Connection timed out

Feb 2 22:24:21 localhost postfix/smtp[1013]: connect to mta6.am0.yahoodns.net[98.136.217.202]:25: Connection timed out

Feb 2 22:24:21 localhost postfix/smtp[1014]: connect to gmail-smtp-in.l.google.com[173.194.76.27]:25: Connection timed out

Feb 2 22:24:21 localhost postfix/smtp[1015]: connect to gmail-smtp-in.l.google.com[173.194.76.27]:25: Connection timed out

Feb 2 22:24:21 localhost postfix/smtp[1012]: connect to aspmx.l.google.com[173.194.68.27]:25: Connection timed out

Here is /etc/postfix/main.cf http://pastebin.com/nHQhh8Bp

/etc/postfix/master.cf http://pastebin.com/nnJBP9mh

Result from #> netstat -nlptu http://pastebin.com/PKJX6xC1

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2 Answers 2

Reset to default
7

Outgoing SMTP on port 25 is blocked by default for all Digital Ocean users. You'll need to contact them if you want it unblocked.

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3
  • Thanks Michael, I 've just asked them to open it. I forgot to check that since I used their own website tutorial to setup Postfix...I'll update this as soon as they answer me.
    – Newtonx
    Feb 3, 2014 at 2:28
  • You're right. Digital Ocean opened port 25 after I asked for it.
    – Newtonx
    Feb 4, 2014 at 11:05
  • This is also the case for Hetzner Cloud, you can request to unblock it after 1 month, more info here
    – Baa
    Apr 1, 2023 at 15:26
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Check your nameserver in /etc/resolv.conf, try Google's 8.8.8.8:

sudo vi /etc/resolv.conf

Change the nameserver IP:

nameserver 8.8.8.8

Then restart postfix:

sudo /etc/init.d/postfix restart
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