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limiting SPAM

2003-11-22 08:32:01

Is there something which prevents spammers from sending their messages with a null reverse path in the envelope? In other words, with
in the SMTP exchange?

As I am developing a MTA in which I hope to limit spam by filtering on the reverse path, it looks to me like this opening intended for error messages might be a big hole in my security.

Thank you,
Rich Hammer
Hillsborough, N.C.

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