Low memory condition causing mail server login errors?

[albatroz]

I am receiving reports from several users saying that they are receiving login errors
asking for a correct password. The curious thing is that all of them have been working
perfectly during the last days. So I was wondering if maybe a peak of use can cause
a condition where Exim is not recognizing user passwords.

Clamav is usually a memory hog on busy email servers, so who knows...

 

[ThinIce]

What is the relevant line in /var/log/maillog /var/log/exim_mainlog when this occurs, are there any specific errors shown there?

 

[cPanelMichael]

Hello

Is this system using Courier or Dovecot? What entries are logged to /var/log/maillog when this happens?

Thanks.