SMTP using ipaddress ok but using mydomain.com timeout

[yudidw2]

So do not wonder why Thunderbird fails.

I definitely advise you to look at firewall rules and log to ensure you can access.
What is very strange to me is that you can access using IP.
Can you try to make it simple, from Thunderbird standpoint (for testing purpose) and set up your SMTP server using port 25 (no TLS, no auth...)?

nothing block in firewall.
still with no tls and auth mydomain timeout

[christian]

For what I understand (i.e. very little for the time being  ), mail.yourdomain.com do not point to IP you are using or at least this is my current feeling.
Let me explain:

if

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telnet 192.168.42.2 25works but

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telnet mail.yourdomain.com 25doesn't, then this is most likely not the same server.
I also realize, reading again and again what you wrote, thet firewall and mail are different servers. Am I correct?
1 - Does it mean that firewall if not Zentyal server?
2 - when you wrote "nothing in FW logs", does it mean at 192.168.42.1 or FW at 192.168.42.2 (BTW is FW running on Zentyal server?)