[CentOS] Mail has quit working

Hello,

Mail has come to an abrupt stop. Running C7, postfix and dovecot. Using Roundcube as the client.

Mail stopped working Saturday and I cannot figure was has happened. I have not touched this server except to upgrade packages. I believe Roundcube was updated maybe a week ago but know I was getting mail since then.

Crond is no longer send mail. I checked /var/spool/mail as well as /Maildir in home directories. Zero byte files.

Checked all logs and the only thing I could find was in /var/log/maillog : warning hostname localhost does not resolve to address 127.0.0.1

I corrected that by changing inet_interfaces to localhost from all in postfix.cf

When I try to log in with Roundcube, it just times out.

I'm stuck!

TIA for any suggestions!!