Trouble making it smart...

[Chris Ditri]

Hello again.

For the past several months, I have had bogofilter running nicely on my email 
server.

Since I don't ever want anything from our domain to be considered spam, I put 
in a line in my procmailrc that says if it is from our domain, ignore it -- 
don't process it through bogofilter.

The problem is that recently spammers have been able to forge the headers such 
that it appears that the email comes from the same person it is sent to.   
Those spams, of course, slip through.  That is bad.

So, it seemed to me that if I can make my email server have an extra header 
unique to my server, I could then tell procmail to look for that header 
instead of our domain name.  It all seemed to work yesterday... but this 
morning I came in and it seems that some of the in-bound spam (about 30%) is 
getting that header appended to it when it comes through our server!  Again, 
this is bad, since email with our signature header is not processed through 
bogofilter.

Why is this happening?  I hacked my sendmail.cf file and added an "H?M?" line.  
It seems to me that my unique header should only be added to outgoing mail.  
Something is awry... Can someone help me out here?

Thanks.


Chris