At 1:20 AM -0400 2003/10/24, David Maxwell wrote:
Every decent SMTP MTA adds a 'Received-by:' header, which includes the
IP of the host that made the SMTP connection. Even open relay MTAs add
this, so you'll still have the IP of the sender of the email.
How many "decent" MTAs are open relays? Not many. Most "decent"
MTAs these days will refuse to be an open relay unless explicitly
configured that way.
How many spammers use open relays anymore? Not many. Most use
open proxies now.
--
Brad Knowles, <brad(_dot_)knowles(_at_)skynet(_dot_)be>
"They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety."
-Benjamin Franklin, Historical Review of Pennsylvania.
GCS/IT d+(-) s:+(++)>: a C++(+++)$ UMBSHI++++$ P+>++ L+ !E-(---) W+++(--) N+
!w--- O- M++ V PS++(+++) PE- Y+(++) PGP>+++ t+(+++) 5++(+++) X++(+++) R+(+++)
tv+(+++) b+(++++) DI+(++++) D+(++) G+(++++) e++>++++ h--- r---(+++)* z(+++)
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