Courrier-imap authetication failed

[Assi Akafou Eric Désiré]

Hi there,

I'm running courrier-imap-0.34  for my webmail (IMP) users authentication.
It works fine for few days and then some authentication problems occured.
We need to restart manually courier-imap to allow authentication. We have
6000
mails account running on redhat 7.1 with 768Mo RAM, 500MHZ CPU.
Is there any other IMAP server than support MAILDIR that i can use in
replacement
of courier-imap ?

Regards,