Previously, when our server received an email it would slap the rcpt to in the received headers by adding a for <...> any ideas what has changed?

Any pointers would be grateful.

Headers received today:

Return-Path: xxxxxxxxxxxxxxxxxxx@xxxxxxxxxxxxxxxx Received: from psmtp.com (exprod8mx220.postini.com [64.18.3.120]) by mail.pdinc.us (8.12.11.20060308/8.12.11) with SMTP id m7CCwh6o006066; Tue, 12 Aug 2008 08:58:44 -0400 Received: from source ([198.185.182.20]) (using TLSv1) by exprod8mx220.postini.com ([64.18.7.10]) with SMTP; Tue, 12 Aug 2008 05:58:42 PDT Received: from hq-exout01.anteon.com ([10.170.1.216]) by hq-ipt01.anteon.com with ESMTP; 12 Aug 2008 08:58:16 -0400 X-SENDER-IP: 10.170.1.216 X-SENDER-REPUTATION: None X-IronPort-AV: i="4.32,195,1217822400"; d="pdf'?doc'32?xls'32,32?zip'32,32,48?scan'32,32,48,208,217,32,48"; a="236730957:sNHT2674851018" Received: from HQ-EXVS05.anteon.com ([10.170.1.146]) by HQ-EXOUT01.anteon.com with Microsoft SMTPSVC(6.0.3790.3959); Tue, 12 Aug 2008 08:58:16 -0400 x-mimeole: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----_=_NextPart_001_01C8FC7B.15CE4044" Subject: SEAPORT E, RFP, Calibration Standards Management Support , Navy-FISC, Corona, CA, New - Incumbent Known, Due Date: 8/22/2008 6:00:00 PM, N00024-08-R-3381 Date: Tue, 12 Aug 2008 08:58:14 -0400 Message-ID: 2CFD33B485D9DE4E9DD95727F68FBBA85DD2C1@HQ-EXVS05.anteon.com X-MS-Has-Attach: yes X-MS-TNEF-Correlator: Thread-Topic: SEAPORT E, RFP, Calibration Standards Management Support , Navy-FISC, Corona, CA, New - Incumbent Known, Due Date: 8/22/2008 6:00:00 PM, N00024-08-R-3381 Thread-Index: Acj8exTmRKNp5IQVQnS543hWImbznw== From: "Hopwood, Geoff" xxxxxxxxxxxxxxxxxxx@xxxxxxxxxxxxxxxx Bcc: X-OriginalArrivalTime: 12 Aug 2008 12:58:16.0577 (UTC) FILETIME=[1652EF10:01C8FC7B] X-pstn-neptune: 1/1/1.00/92 X-pstn-levels: (S:99.90000/99.90000 CV: 0.0940 P:95.9108 ) X-pstn-settings: 1 (0.1500:0.1500) CV gt3 gt2 gt1 p X-pstn-addresses: from xxxxxxxxxxxxxxxxxxx@xxxxxxxxxxxxxxxx [125/4] X-pstn-cave-hit:

Headers received 2 years ago:

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