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Re: limiting SPAM

2003-11-22 09:10:47

On Sat, Nov 22, 2003 at 10:31:54AM -0500, Richard O. Hammer wrote:
Is there something which prevents spammers from sending their messages 
with a null reverse path in the envelope?  In other words, with
   MAIL FROM: <>
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.

We have been traveling for years thru that path.  It helps NOTHING.
Moreover, it prevents legitimate error messages from making through
to your users, which is getting to be rather serious pain in itself.

Faked source addresses are more common in spams than the empty paths,

Thank you,
Rich Hammer
Hillsborough, N.C.

/Matti Aarnio   <mea(_at_)nic(_dot_)funet(_dot_)fi>

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