Sure this is a problem with postfix? Maybe there is no dovecot or so installed.
For me it looks like thunderbird uses the maildir, because it is installed on the server. Just my 5 cent. Boris > Am 16.06.2016 um 12:19 schrieb Wietse Venema <wie...@porcupine.org>: > > Bob Lydiate: >> I installed postfix server on Ubuntu 16.04 using a youtube video from >> 'randomthoughts'. All of the testing and everything worked just fine, still >> does. When I try to use Outlook to connect to my email account on my >> server, I get nothing. Outlook says it was rejected, the logs on the server >> do not even reflect that a connection was attempted. I have checked >> /var/logs/syslog, /var/logs/mail.log, /var/logs/mail.err, >> /var/logs/auth.log. I have rechecked my setup step by step and still cannot >> connect. This does not only happen through Outlook, but through Thunderbird >> which is actually on the server. After several days of this, I am at a >> total loss, and have no idea where to look next. Any help would be >> appreciated. > > Basic test from a client machine: > > Linux, Mac: > bash$ telnet hostname 25 > > Windows: > C:\> telnet hostname 25 > > If the telnet command fails, you may need to update firewall rules. > > Wietse