POP login failures, Exim

[elkram]

Ever since the most recent cPanel upgrades, we've been receiving hundreds of failed POP logins daily. Various clients from various origin locations are experiencing this. We still are using Courier as the server.

Error messages received vary but some are "mailbox access denied" and some are "incorrect password." Nothing has changed on the client side.

Many of the failures occur when using the POP connector of Exchange Server to retrieve mail. That means, for us, perhaps 20-30 separate user logins within a few minutes of each other.

Has the maximum # of simultaneous POP connections been reduced?

Exim logs seem to indicate that the answer is yes. If so, how do I increase that limit, and are there any reasons not to do so?

Thanks in advance.

[elkram]

My VPS provider, ServInt, provided a resolution. This appears to work:

Increase the Number of Authentication Daemons under Mailserver Configuration under Service Manager in WHM.

Thank you, ServInt.

[ben-av]

Just wanted to add to this, we have a server (updated automatically to the new Release build in December) - with customers who are experiencing the same thing.

After checking.. the Max POP3 checks per hour setting is gone. Hopefully that solution is permanent, and works!

Other than that... can cPanel explain whats going on?