Webmaster2020.com

my mail server is not accepting from other server on the same network.
But i did set it to subnet in main.cf anyone has any ideas ?

are you sending to a user on the server.
Do a test from the client: and check the logs on the client and on the server.

The mail leaves the client to the server,
but it is not delivered.

Are you sure you are sending it to the right account?

sometimes you need to also add the domain name (even if it is not a public domain).

thanks, that was indeed the problem.
When I add the domain name,
the mail is delivered.

I thought that before, the hostname was enough?