I've not tweaked my ISPConfg setup for a while because everything has been working beautifully.
I've set up a new domain and added the mail domain and added two mailboxes.
The web domain works fine (theerfore DNS is good)
But the email boxes cannot be reached - they fail authorization.
All other domains/mailboxes are working correctly.
I've upgraded my ISPConfig to 18.104.22.168. Hasn't helped.
Dovecot version is 1.2.17
Centos version 5.7(final)
Permissions in /var/vmail/ all look correct.
Where do I go from here?