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Postfix can't send mails externally

Posted September 6, 2017 4.8k views
SecurityDigitalOceanApplicationsUbuntu 16.04

Hi everyone,

I installed and configure on Ubuntu 16.04 droplet but it couldn’t send email externally.

I’ve tested this scenarios:

  • Send an internal emails, it works.
  • send an email from gmail or yahoo mail or other email service, it works too, so I receive the email in the appropriate mailbox.

The unique scenario that doesn’t work is when i try to send to an external email services such as google, yahoo, outlook or other site.

Looking into the Postfix logs I got the some different error messages:
a. Network is unreachable
b. Connetion timeout

Could you please help me? I already opened a ticket for looking into this issue (ports configuration and droplet exceptions) but I didn’t receive any feedback/new about the solution… so I’m considering change my VPS cloud provider.

Could you recommend me any other VPS Could server provider?

Thank you all your help.

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3 answers
kamaln7 September 8, 2017

Hi! Can you please post the output of the following command?

nc -z smtp.gmail.com 25

If it does not output Connection to smtp.gmail.com port 25 [tcp/smtp] succeeded!, it’s possible that outbound SMTP is blocked on your droplet. In that case, the support team will be able to unblock it for you!

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anibaldedeus February 13, 2019

Hi, I’m facing the same issue, but on a Centos7:

Feb 13 18:18:38 xxx postfix/smtp[28162]: 71259434AFB: to=<xxx@yahoo.com.br>, relay=none, delay=150, delays=0.06/0.03/150/0, dsn=4.4.1, status=deferred (connect to mta5.am0.yahoodns.net[98.136.102.54]:25: Connection timed out)

Feb 13 16:34:09 xxx postfix/smtp[27606]: connect to gmail-smtp-in.l.google.com[74.125.192.26]:25: Connection timed out

All my Outbound rules are allowed… Can you help?

Btw, running nc -z smtp.gmail.com 25 takes a while and response is empty

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frank17 March 17, 2019

I am facing the same problem. I run nc ... and no output…

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