I recently started renting a Ubuntu 18.04 VPS from DigitalOcean. The intent was to run a cheaper email system instead of alternatives like GSuite and Microsoft Business for me and a fellow developer, and split the costs. I've setup very basic email servers before, but in this case, since we both have our own domains and users, using virtual domains/virtual users is a must.
I followed a tutorial here, but my server won't let me connect. When I try viewing logs in any sort of way, everything seems fine. Entering the command tail -f /var/log/syslog | grep dovecot, then monitoring the results as I try and log in only produces this:
Sep 29 03:11:16 MEMail dovecot: imap-login: Login: user=<sysadmin@meproduction.org>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=28028, secured, session=<lUrg7Pl2ls9/AAAB>
Sep 29 03:11:16 MEMail dovecot: imap(sysadmin@meproduction.org): Logged out in=44 out=870
That's all the logs I was able to find. /var/logs/mail.log was empty, and postfix doesn't seem to show anything what-so-ever. When I try and login via SquirrelMail, CloudFlare ( my NameServer ) shows a page saying a 502, but only if I login to a valid account. Entering an invalid user just says that my login is incorrect, as you'd expect.
What logs am I missing, or maybe steps the tutorial messed up that you see? I would like to get the email system running ASAP, because I don't want to setup anything else until it's done, and some things require it ( like adding a spam filter, and S/MIME, and adding all those extra DNS and SSL features for security ).
I did find an answer. Apparently the tutorial I followed must've been formatted incorrectly, or done something wrong. After reverting my VPS, and following a different tutorial, I was able to set it up. If anybody else is trying to setup something like I did, follow this tutorial from DigitalOcean. I recommend looking firstly for tutorials from them, as they're usually well made and work well.