DigitalOcean blocked port 25? We have to use 3party relayhost ? eg. a free mailjet

Oct 23 17:23:03 sapp postfix/smtp[104720]: connect to[]:25: Connection timed out
Oct 23 17:23:03 sapp postfix/smtp[104720]: connect to[2404:6800:4003:c00::1b]:25: Network is unreachable
Oct 23 17:23:33 sapp postfix/smtp[104720]: connect to[]:25: Connection timed out
Oct 23 17:23:33 sapp postfix/smtp[104720]: connect to[2607:f8b0:400e:c00::1b]:25: Network is unreachable

I tried every suggested method:

  1. Set hostname to FQDN.
  2. Set PTR in DNS.
  3. Set spf in DNS.
v=spf1 +a +mx +ptr +ip4: ~all

Postfix is still unable to send mail to Gmail.

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Bobby Iliev
Site Moderator
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November 4, 2021
Accepted Answer


It is possible that port 25 is closed for new accounts. This is something DigitalOcean has been doing to reduce spam on their network. Please do not think that they are accusing you of sending spam, it is more that they simply cannot accurately determine who is going to send it.

Stopping spam is a constant fight, so DigitalOcean has implemented some restrictions on newer accounts. To qualify for the ability to send out emails, DigitalOcean requires accounts to wait 60 days before they can look into removing the restriction. Once your account has reached 60 days of stable use, please do reach back out to the DigitalOcean support team so they can look into this for you.

In the meantime, you could use port 587 instead.

Hope that helps! Regards, Bobby

We have forward and reverse DNS setup correctly, however postfix still has issues sending to Gmail and outlook. Does anyone have SMTP Relay service recommendations? Does digitalocean have smtp relay?

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