Anyone have any technique or suggestions on how to save a domain name from a spoofer? 

I've tried to have the spammer's websites shut down but NameCheap has no problem hosting the spammer's websites even when presented with mounds of evidence of spoofing someone elses domain as well as allowing obviously faked registration ID info so they have been no help at all.  Oh for the good old days of regulated domain registration.

No way to track the emails due to an obvious zombie network.

Here's and example of one the spammer's websites
<http://www.dates4funz.com/extra/angelsweet3>
Spammer always uses the "angelsweet3"

Anyone have any suggestions?

If not, is there at least a way to block the rejection notices that have the orignal email attached with this text in it?

If they have a link to <http://www.dates4funz.com/extra/angelsweet3>
in every one of their emails, a keyword block

(\bdates4funz\.com\b)

will trash every one of them.

Edited by Marcus

Alan wrote: Anyone have any suggestions? If not, is there at least a way to block the rejection notices that have the orignal email attached with this text in it?

See my first post.

You might want to utilize the "Authorized To Emails" and enter your legit users.  This should stop the NDR back to fake users.  Should cut down on of at least some of it.

Why not use LDAP tools and have it create the AuthorizedTo.txt file every 10 to 30 minutes. It runs faster by SF reading it into memory than having ldap queries run for each and every incoming email.