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Every email that comes in has a header. In that header is the From address and the IP of the senders server. All sendmail has to do is compare the From address to the IP of the server sending the email and if they don't match dump the damn email. No white lists, no black lists, no digital...

Which is fine, but I've been trying to get an answer since May 25, 2004. Do I need to open a whole new thread to get back to my problem?

How come I can't just make sendmail look for people spoofing their email addresses? That's all I wanted to do when I started this thread.

Will adding: FEATURE(`dnsbl', `sbl-xbl.spamhaus.org', `"571 ACCESS DENIED to <"$&f"> thru "$&{client_name}" by /spamhaus/ ;Please see http://www.spamhaus.org/sbl/'")dnl to my sendmail.mc file cause sendmail to check to make sure the From address is coming from the correct domain? That's...

I already have anti-spam software/filters. The problem is that I allow email from myself, so that I can email myself things. Spammers are sending me email and making it look like it is coming from me. I need a way to stop this from happening without denying email from myself.

I've been getting spam to a local address with a From field that matches the To field. This is causing the spam to skip over my filters as it seems to be for me, sent by me. Is there anyway I can configure sendmail to check to make sure the From field is really coming from the correct server?