Well, I set up everything that is described in Virtual Users And Domains With Postfix, Courier And MySQL (+ SMTP-AUTH, Quota, SpamAssassin, ClamAV) howto.
And everything works great, except one thing:
I can't connect to my mailserver with for example mozilla thunderbird mail client from any another computer. It says that password is wrong, and even courierpop3login says:
Jan 6 22:10:07 lintvern courierpop3login: LOGIN FAILED, ip=[::ffff:188.8.131.52]
But I have the right password, I am pretty sure about that.
Is there anything else I should enable?