Spammers Most Likely Users Of E-Mail Authentication (TechWeb)

Spammers Most Likely Users Of E-Mail Authentication (TechWeb)

That method has a serious drawback, applied unilaterally -- it defeats white lists. Every mail is from an address the recipient has never seen or sent to before. It also screws up various other email sorting on the receiver's end.

I use a simplified version of that -- I always include my name in the From: header (in the conventional manner). Bounce messages usually contain a copy of the headers. If I see a From: header with my email address but not my name, I know I did not send it. Spammers rarely have both my name and my address.

This is a filter just for my personal mailbox, of course.