SMTP is running but not publicly accessible at <ip>:25

On Azure VM, I installed MIAB. I still waiting for my nameservers glue to propagate, but I thought this should already work.
I opened port 25 in the Azure portal both for inbound and outbound connection, tested with nc from another machine:

nc -zv <IP> 25
Connection to <IP> port 25 [tcp/smtp] succeeded!

but the status page still shows this error. it indeed timeout when running the same command from the VM console.

Any ideas what I am doing wrong?
Tried: rebooting the VM, sudo mailinthebox.

Thanks in advance.

  • Sending email is now disabled on port 25 — you must log in to port 587 to send email, per the long-standing mail instructions.

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