How to detect forged From and Reply-to addresses from your own domain

Michael Masse mrm at
Mon Mar 8 17:17:04 GMT 2010

>>> Mark Sapiro mark at> 3/6/2010 11:19 AM >> ( mailto:mark at )

My ISP redirects all port 25 connects to its own servers so even if I
know what I'm doing, I can't use your MTA for my outgoing mail for this

I've heard of ISP's doing this with port 25, but not 587 which is a standard alternative port for smtp submittal.  Are there ISP's redirecting 587 as well?

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