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Bounce spam at server level?

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DaveC

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Apr 6, 2015, 1:57:41 PM4/6/15
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When an invalid address is used in an email, the target mail server bounces
that message back to the sender with a "no such address" error.

Why can't server-level user filters be implemented such that users could
configure their mail account to reject unwanted messages with a "no such
address" error?

As it is the spammers can be confident of a valid email address when they
don't get a bounced message. Why are we not bouncing spam rather than just
trashing it?

Comments?

Thanks.

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