Question

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

Posted October 23, 2021 78 views
CentOS 8
Oct 23 17:23:03 sapp postfix/smtp[104720]: connect to gmail-smtp-in.l.google.com[142.251.10.26]:25: Connection timed out
Oct 23 17:23:03 sapp postfix/smtp[104720]: connect to gmail-smtp-in.l.google.com[2404:6800:4003:c00::1b]:25: Network is unreachable
Oct 23 17:23:33 sapp postfix/smtp[104720]: connect to alt1.gmail-smtp-in.l.google.com[173.194.202.26]:25: Connection timed out
Oct 23 17:23:33 sapp postfix/smtp[104720]: connect to alt1.gmail-smtp-in.l.google.com[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 include:_spf.google.com include:spf.mailjet.com +a +mx +ptr +ip4:128.199.246.555 ~all

Postfix is still unable to send mail to Gmail.

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1 answer

Hello,

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