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On Tue, 26 Mar 2013, Dave Gattis wrote:
Our emails are redirected from the home office causing all vacation responses to fail with, "discarding vacation response for implicitly delivered message; no known (envelope) recipient address found in message headers".
=== headers from reply Return-Path: <dave.gattis@domain-a.com> X-Original-To: dave.gattis@domain-b.com Delivered-To: dave.gattis@domain-b.com Received: from spamcop.main.ch (spamcop.main.ch [83.144.241.40]) by domain-b.com (Postfix) with ESMTP id 0E4E81C101DE for <dave.gattis@domain-b.com>; Tue, 26 Mar 2013 14:35:13 -0400 (EDT) Received: from ex.domain-a.com (ex.domain-a.com [83.144.240.35]) by spamcop.main.ch with ESMTP id 0dP4XCjZrdDY5l1Q for <dave.gattis@domain-b.com>; Tue, 26 Mar 2013 19:41:36 +0100 (CET) Received: from EX2.domain-a.com ([fe80::acd3:8e53:bcb6:7a4%11]) by ex2.domain-a.com ([fe80::acd3:8e53:bcb6:7a4%11]) with Microsoft SMTP Server id 14.01.0355.002; Tue, 26 Mar 2013 19:39:54 +0100
From: Dave Gattis <friends@sender.com> To: SUMACO Gattis Dave <dave.gattis@domain-a.com>
You have two problems:
a) "no known (envelope) recipient address found in message headers" means, that the vacation :addresses list does not contain
dave.gattis@domain-a.com
because vacation probes the entries of the :addresses list against To and CC.
b) the messages are _resend_ not forwarded by spamcop.main.ch to your MTA. By doing so the original *envelope* sender address is lost, which is *not* the entry in "From:". Therefore vacation would send the reply to:
dave.gattis@domain-a.com
which is the return path per your excerpt. You could verify that by finding the envelope sender in the postfix logs, I guess; or by fixing a).
Actually, I'm not sure if pigeonhole can pick up the address to reply to from a mail header - I do not see any hints in the sample config. So, maybe, you need to ask spamcop.main.ch to preserve the return address.
Note: Changing the envelope sender is not bad by itself, it solves several problems with forwarding; a well-known MTA can do this, too: http://social.technet.microsoft.com/Forums/en-US/exchange2010/thread/8006eab... , but you get other problems rewriting the sender address.
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