hiding email addresses

Hello,

   My X-Date is showing up like:

<!--X-Date: Thu, 27 Apr 2006 07:46:59 &#45;0700 (PDT)   (envelope&#45;from
sample(_at_)example(_dot_)com) -->

How can I prevent the email address from showing in the header like that? I'm
already using the <SPAMMODE> in my .mrc.

Another question: does spammode break some messages from being keyworded by
Namazu? My Namazu is not picking up 100% of the message ids - so I have many
blank lines in my NMZ.field.message-id file.

Thanks,
Alex