From: Noel Jones (njonesmegan.vbhcs.org)
Date: Thu Nov 06 2008 - 17:01:14 CST

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Robert Fitzpatrick wrote:
> I have double-bounce messages in the queue, not sure what that is all
> about. For instance, to Yahoo addresses. Is this related to the fact
> that I am doing AV to those addresses?
>

Recent postfix versions use the double-bounce address as the
sender of address probes.

Sender address verification should be used carefully and
selectively - some sites will consider probes to non-existent
addresses a dictionary attack and block you.

--
Noel Jones

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