[Dovecot] HG changes affecting received headers

[Thomas Leuxner]

Let me say this is a rather cosmetic issue, but it appears with the latest 
commits (around 2.2.5 release) the scheme of 'Received' headers has changed for 
LMTP:

1) Inet socket:
Return-Path: <dfn-adv-boun...@dfn-cert.de>
Delivered-To: <t...@leuxner.net>
Received: from spectre.leuxner.net ([188.138.0.199])
        by spectre.leuxner.net (Dovecot) with LMTP id 8AkXDF5cA1LvDgAAZ53dLw
        for <t...@leuxner.net>; Thu, 08 Aug 2013 10:52:46 +0200

2) UNIX socket:
Return-Path: <dfn-adv-boun...@dfn-cert.de>
Delivered-To: <t...@leuxner.net>
Received: from spectre.leuxner.net ([])
        by spectre.leuxner.net (Dovecot) with LMTP id q8WuGflcA1I3DwAAZ53dLw
        for <t...@leuxner.net>; Thu, 08 Aug 2013 10:55:21 +0200

3) Old (Pre 2.2.5) build, UNIX socket:
Return-Path: <dfn-adv-boun...@dfn-cert.de>
Delivered-To: <t...@leuxner.net>
Received: from spectre.leuxner.net
        by spectre.leuxner.net (Dovecot) with LMTP id 8NiKKX0h+lFRIAAAZ53dLw
        for <t...@leuxner.net>; Thu, 01 Aug 2013 10:51:09 +0200

While it probably should resolve the FQDN in 1) (Postfix does), not sure what 
it should do with a UNIX socket in 2). Previously as shown in 3) it had none of 
it...

Thomas

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