Hi, i’m installing mailcow on azure VPS.
Everything works fine, but my emails dodesn’t arrive.
I have this in queue manager: queue
How to fix that? 🙁

  • It’s not a matter of “mailcow works on Azure”, as SMTP is a standardized protocol using TCP/25. It’s not unique to mailcow.

    Technically you can change the SMTP port, but no other mailservers won’t. So you can basically only send mails yourself then.

    tl;dr: No.

Troubleshoot outbound SMTP connectivity in Azure

docs.microsoft.com
Troubleshoot outbound SMTP connectivity in Azure
Learn the recommended method for sending email and how to troubleshoot problems with outbound SMTP connectivity in Azure.
Microsoft Learn

Outbound SMTP connections that use TCP port 25 were blocked.

Apparently Azure blocks outgoing SMTP.

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    pkernstock
    😱
    So mailcow won’t work on Azure? or I can change port 25 or smth..

      It’s not a matter of “mailcow works on Azure”, as SMTP is a standardized protocol using TCP/25. It’s not unique to mailcow.

      Technically you can change the SMTP port, but no other mailservers won’t. So you can basically only send mails yourself then.

      tl;dr: No.

      7 days later

      Hetzner doesn’t block 25 but your email may go in spam on MS and Google
      Digital Ocean blocks 25 by default but you can ask to have it unblocked
      AWS does not block 25 but they have strict TOS, they will cancel your account if you spam.
      Physical server on decent ISP or in colo works very nicely.

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