I have serius troubles with POP3 service, I have 5000 users who read their mails and the problem is that constantly the client is disconnected from POP3 and get the following message:

Task 'pop3.xyz.com - Receiving' reported error (0x800CCC0F) : 'The connection to the server was interrupted. If this problem continues, contact your server administrator or Internet service provider (ISP).'

The server has RedHat Enterprise 5 OS and the HW is:

4 processor Intel(R) Xeon(TM) CPU 3.00GHz Memory 4 GB Srotage 6 SCSI DISK 1 Tera

The packages installed are:

courier-authlib-mysql-0.59.3-10.rh5Server courier-authlib-devel-0.59.3-10.rh5Server courier-imap-4.1.3-1.5Server courier-authlib-0.59.3-10.rh5Server

I already did the change in the MAXPERIP before was 20 now is 200 MAXPERIP=200, also I dit the change in MAXDAEMONS before used 100 and now use 400, MAXDAEMONS=400

Also I did the changes in authdaemonrc, the variable daemons is now 40, daemons=40

In the log I can see the DISCONNECTED in the session of the user, check bellow the message and log for one custumer:

Aug 29 09:00:11 pop pop3d: LOGIN, user=erne...@xyz.com, ip=[::ffff:165.98.236.222]

Aug 29 09:00:11 pop authdaemond: SQL query: SELECT email, password, "", 5000, 5000, "/home/vmail", CONCAT(SUBSTRING_INDEX(email,'@',-1),'/',SUBSTRING_INDEX(email,'@',1),'/'), quota, "", "" FROM users WHERE email = "erne...@xyz.com~T

Aug 29 09:00:11 pop authdaemond: authmysql: sysusername=<null>, sysuserid=5000, sysgroupid=5000, homedir=/home/vmail, address=erne...@xyz.com, fullname=<null>, maildir=xyzcom/ernesto.reyes/, quota=157286400, options=<null>

Aug 29 09:00:11 pop authdaemond: Authenticated: sysusername=<null>, sysuserid=5000, sysgroupid=5000, homedir=/home/vmail, address=erne...@xyz.com, fullname=<null>, maildir=xyz.com/ernesto.reyes/, quota=157286400, options=<null>

Aug 29 09:00:36 pop pop3d: DISCONNECTED, user=erne...@xyz.com, ip=[::ffff:165.98.236.222], top=0, retr=5243995, rcvd=74, sent=5312850, time=26

Before that I intalled virtual users I had DOVECOT and this problem not exist, If this is problem with outllok, I have serius problem, because I have 5000 users and the 70% have outlook like MUA.

How can I solve the problema? What changes or configurations should I do?

Thanks in adcanced,