Postfix cannot receve email from outside - Please help

I can ship to external address but i can only receve from internal address, if I try from my gmail account i receve the message:

The recipient server did not accept our requests to connect.

Can you please help me what to check?

SYSTEM INFORMATION
OS type and version Ubuntu Linux 22.04.3
Webmin version 2.105
Virtualmin version 7.9.0
Related packages SUGGESTED

Hello,

You need to check if port 25 isn’t blocked on your network, by using the telnet command like this:

telnet smtp.gmail.com 25

What output do you get when running this command?

Hi Ilia,
if i telnet my domain like this:
telnet mail.mydomain.it 25
or
telnet smtp.mydomain.it 25

I riceve: impossible to open a connection with the host using port 25

what i can do?

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