On a new linux mailserver I was having an erratic problem with mysql and pop3 authentication. Authentication works 90+% of the time. However, using The Bat! and Outlook clients, I randomly see the following authentication failure and the user must poll pop3 again - which then succeeds.

-- this text from TheBat --
FETCH - Server reports error. The response is: vmysql: can't read settings from /home/vpopmail/etc/vpopmail.mysql -ERR aack, child crashed


Here's /home/vpopmail/etc/vpopmail.mysql
-rw-r-----  1 vpopmail vchkpw   45 Oct  1 08:25 vpopmail.mysql

I didn't think the pop3 daemon is crashing (i.e. bad mem limits in 'run' file).
qmailctl stat:
/service/qmail-send: up (pid 2568) 3791 seconds
/service/qmail-send/log: up (pid 2570) 3791 seconds
/service/qmail-smtpd: up (pid 2574) 3791 seconds
/service/qmail-smtpd/log: up (pid 2569) 3791 seconds
/service/qmail-pop3d: up (pid 2571) 3791 seconds
/service/qmail-pop3d/log: up (pid 2576) 3791 seconds
messages in queue: 0
messages in queue but not yet preprocessed: 0

SOLUTION:
In spite of what the qmailctl stat told me, I found that increasing the pop3 'run' file memory limit from 8000000 to 12000000 appears to suppress this issue.

Any thoughts on "why" would be welcome.  Otherwise, one for the archives...
Thanks!
Dave.

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