[imp] Some users can login, some can't.

[Erich Zigler]

I am currently working with the following configuration

FreeBSD 4.5-STABLE
IMP 3.1
Horde 2.1
Courier-IMAP 1.4.3
Vpopmail 5.2
PHP4 4.2.1
Apache 1.3.26

I love IMP, but this one problem has me stumped.

User A can login once or twice, but then it denies him login. It doesn't 
matter what browser he uses. I can reproduce it here. The logfile shows this 
when he tries to login.

Jul  9 09:53:28 lpp imapd: Connection, ip=[::ffff:127.0.0.1]
Jul  9 09:53:33 lpp imapd: LOGIN FAILED, ip=[::ffff:127.0.0.1]

It looks like the IMAP server isn't even getting his username.

But every other user can log in to their accounts. I can log in to mine, 
without any problems.

Jul  9 09:54:24 lpp imapd: Connection, ip=[::ffff:127.0.0.1]
Jul  9 09:54:24 lpp imapd: LOGIN, user=3Derich@domain.com ip=[::ffff:127.0.0.1]
Jul  9 09:54:24 lpp imapd: LOGOUT, user=3Derich@domain.com, 
ip=[::ffff:127.0.0.1], headers=0, body=0
Jul  9 09:54:24 lpp imapd: Connection, ip=[::ffff:127.0.0.1]
Jul  9 09:54:24 lpp imapd: LOGIN, user=3Derich@domain.com, ip=[::ffff:127.0.0.1]
Jul  9 09:54:24 lpp imapd: LOGOUT, user=3Derich@domain.com, 
ip=[::ffff:127.0.0.1], headers=104, body=0

I can fix this problem by restarting the IMAP server, but doing that every 3 
hours is not desired.

Any thoughts?