I recently used this guide: https://help.ubuntu.com/community/Postfix
to set up a postfix mail server. I've got it to receive emails at my domain from gmail, but I can't send them from my domain to gmail.
Does anyone have any ideas what could be causing this issue?
Here are some things in the mail queue:
B02802A024E 446 Tue Mar 5 16:09:50 firstname.lastname@example.org
(connect to alt2.gmail-smtp-in.l.google.com[220.127.116.11]:25: Connection timed out)
999D42A03AF 373 Tue Mar 5 16:56:07 email@example.com
(connect to mta5.am0.yahoodns.net[18.104.22.168]:25: Connection timed out)