Weird sendmail behavior 2003-12-02 - By Joe Polk
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Okay, it's time to post this here.
A client of mine has a sendmail server that up until 2 days ago has worked
flawlessly. Then, suddenly it started slowing down. Nothing in top showed
anything beating the server, save minor memory useage on some httpd child
instances. Restarted httpd, same issue: slow. Restarted sendmail, same.
Checked iptraf. There seemed to be alot of DNS queries. Hmmm...stopped
sendmail and the dns queries subsided. Thing is, they weren't really hammering
the system. Anyway, checked mqueue and there were some messages in there that
were basically bogus or spam requests. Removed them. Things seemed to be
better today, however, something new is happening. One user, and only 1, gets
rejected. We have sendmail setup to use spamcop and spamhaus and this user is
having her outgoing mail rejected using that. This is odd. This user is on a
192.168.0 subnet and so is everyone else. They all work and use Outlook
clients. They have the option of using the webmail client which is working for
her with no problem. She only gets an error when using Outlook. I'm really
stumped, though it may be an easy answer. Anyone?
<<JAV>>
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