[webmin-l] doveot, usermin and webmin crashing

[Barry <we...@i1...>]

I seem to be getting a ton of somehow-malformed spam mails which are 
causing dovecot, usermin and webmin to crash.

System is centos 4.3, sendmail, spamassassin 3.0.14.

A side effect is that some mails get caught in the mail queue.

Another side effect seems to be that
some of the spams are making it through to my remote email client 
without X-Spam headers that are put there by spamassassin.

And another side effect seems to be that any sshd shells I have open are 
closed  remotely meaning I have to restart the session (not sshd) each 
time.

I am getting pounded by these spams - only consistent way I can tell to 
identify them is they all are generated by Microsoft Outlook (big 
surprise!).

Anyone know what might be going on?
Is there a way to block them *before* they get to spamassasin? I have 
checked back over a years worth of emails - if I don't get any from 
Outlook Express it will not be any skin off my back.

Best,

Barry