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SMTP Login Problem

U

usdcservers

Guest
I have just migrated from Ensim and cPanel to Plesk 8.1 and I am now getting complaints from users about not being able to log into SMTP with either password errors or the Server broke connection. Experimenting around if more then 4 users login at the sametime and a 5th tries to login the 5th one or higher will fail.

Coming from a Sendmail and Exim background I have no idea where to begin looking for a fix. Can anyone suggest a fix for this?
 
I have figured out what the problem was, maxperip was set to only 4 in imapd and pop3d.
 
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