I set up a test mail server with postfix and courier on the local network. I did everything according to the manuals found on the network and, in general, it is not much away from the standard configs.
On the server (since it is a test one) there is a GUI and there is an email client called Thunderbird . There are several mailboxes ( linux users) on the server.
The task is to send letters over the local network (from other computers), and they would all be displayed on the server to Thunderbird .
They are sent, but sent only to /var/mail/$USER
. Thunderbird does not see them.
The option with local accounts in Thunderbird disappears, because in reality the mail client will also be not on the server.
How to implement the required?