[Mimedefang] md_check_against_smtp_server and md_graphdefang_log

David F. Skoll dfs at roaringpenguin.com
Tue Mar 26 14:50:45 EDT 2013

On Tue, 26 Mar 2013 11:33:33 -0700 (PDT)
kd6lvw at yahoo.com wrote:

> 3)  Forwarding services shouldn't be randomly probing the ultimate
> destinations.

I disagree strongly (assuming we remove the noise word "randomly")

Attempting to deliver to nonexistent recipients is by far the most
common cause of backscatter, and doing an SMTP call-forward on the
ultimate destination is a simple and cheap way to avoid this.

Your point about post-DATA rejection is valid, but this makes up a very
small percentage of backscatter.

-- David.

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