All of a sudden none of my customers can use any 3rd party mail client - Outlook, etc
They can use webmail, no emails are being lost.
the error everyone gets when they try to receive email from outlook or windows mail or anything that is not webmail is:
Your server has unexpectedly terminated the connection. Possible causes for this include server problems, network problems, or a long period of inactivity. Account: 'mail.blah.com.au, Server: 'mail.blahblha.com, Protocol: POP3, Port: 110, Secure(SSL): No, Error Number: 0x800CCC0F
I have rebooted the mail server. I have googled to death. And can't find any solution at all???
I can telenet in to the mail server. 110 is open. ...Thanks for trying~!
This may sound sound obvious, and I know you can telnet to port 110 but can they? It's not uncommon to forget that as admin, you may have added/whitelisted your own IP addresses, thus meaning you don't experience the same issues
Okay heres a bit more info now that i have had more time to invesigate
At present, all relevent ports are open, and I can telnet into them without any problems. When I telnet using port 25, i can send mail no probs from the command line. However, when I telnet using port 110, using valid credentials, the server drops the connection without notice.
I can access mailboxes from webmail (imap is working ok), but when i connect using pop3 (outlook, outlook express, or any mail client) the connection is established, but as soon as it tries to auth, the server drops the connection without notice.
qmail is working fine, as mail is being delivered and forwarded out ok.
The installation of qmail uses a mysql db for config purposes. (mysql is up and running and connections can be established ok - using scripts, and the fact that imap is authing the customers as they log in).