[CentOS] Mail has quit working

Fri Aug 24 13:59:52 UTC 2018
Pete Biggs <pete at biggs.org.uk>

> Here's the link for the maillog:
> https://paste.fedoraproject.org/paste/kbH2N9Pc~JPuCqVpE1kszQ

OK. There are a couple of things:

   Aug 23 21:47:18 ts130 postfix/smtpd[3750]: warning: hostname localhost does not resolve to address
   Aug 23 21:47:18 ts130 postfix/smtpd[3750]: connect from unknown[]

That needs to be fixed. What does the entry for look like in
/etc/hosts? Have you also defined ::1 to be localhost in /etc/hosts?

   Aug 23 21:47:21 ts130 dovecot: imap-login: Login: user=<tdukes>, method=PLAIN, rip=::1, lip=::1, mpid=3754, secured, session=<9W1yjiR08AAAAAAAAAAAAAAAAAAAAAAB>

So you are connecting over TCPv6 from roundcube to dovecot?  Is that
what you want?

What is the IMAP hostname in the roundcube configuration?