SendMail - Rejected Valid Passwords

I have 50 accounts on a system running Linux 2.0.30 - A few of the
users have this problem - the rest work.
They log on using a mail client and there password is rejected.  They
can telnet to the linux box - log on with the same user id and
password and run pine just fine.
The actual error message is :
There was a problem logging onto your mail server mail server.  Your
password was rejected. Account 'Roachw.com, server Roachw.com.
Protocol: POP3, Server response '-ERR being read already
/usr/spool/mail/jf, port 110, Secure (SSL) no, server error 0x800ccc90
error number 0x800cc92.
Any new users I create have the same problem.

Thanks
ssh@dpn.com
1ssh1Asked:
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df020797Commented:
POP is Post Office Protocol, a way to downlaod mail from one site to another to read them. Normally you have a separate POP program and dont let sendmail handle this at all. Thsi I would recomend, because liek it seems POP support is added in Sendmail and no program is added for sendmail to use as POP daemon. Install the in.pop3d RPM from RedHat and if necessary reconfigure Sendmail NOT to hanlde pop.
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ivan_kCommented:
Just remove all files from '/var/tmp/'.
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