I set up a new virtualmin gpl server last night, backed up my sites and transferred them over.
All is well except for pop mail - when I try to access my mail, I get this in the mail log:
dovecot: pop3-login: Aborted login (tried to use disallowed plaintext auth): user=<>, rip=220.127.116.11, lip=18.104.22.168, session=
This is on a CentOS 7 server set up last night. I don't see any dovecot config settings that look any different than were on my previous server. Authentication methods is set to 'Plain-text' and the Password authentication source is set to: 'Default PAM service (dovecot)'.