Delivery is delayed to these recipients or groups:

Hi guys, I have a client who is part way migrated to office 365. the mx records haven't been changed over yet so have setup forwarders on a 2003 exchange server.

I am getting 'Delivery is delayed to these recipients or groups' for a lot of users. I have included a sample mail header to help diagnose the issue.

Received: from DBXPRD0710HT002.eurprd07.prod.outlook.com (10.255.79.165) by
 DBXPRD0710HT001.eurprd07.prod.outlook.com (10.255.79.164) with Microsoft SMTP
 Server (TLS) id 14.16.263.1; Tue, 29 Jan 2013 05:05:15 +0000
Received: from mail132-ch1-R.bigfish.com (216.32.181.173) by
 DBXPRD0710HT002.eurprd07.prod.outlook.com (10.255.79.165) with Microsoft SMTP
 Server (TLS) id 14.16.263.1; Tue, 29 Jan 2013 05:05:12 +0000
Received: from mail132-ch1 (localhost [127.0.0.1])      by
 mail132-ch1-R.bigfish.com (Postfix) with ESMTP id DF9213001CE      for
 <lindsay.moyes@grahamsdairy.onmicrosoft.com>; Tue, 29 Jan 2013 05:05:10 +0000
 (UTC)
X-Forefront-Antispam-Report: CIP:213.199.180.166;KIP:(null);UIP:(null);IPV:NLI;H:AM1EHSNDR002.bigfish.com;RD:reserved;EFVD:RES
X-SpamScore: -3
X-BigFish: ps-3(zzc89bh54eIc857h4015I9a6kzz1ee6h108eh1202h1e76h1d1ah1d2ah1e9bhzz8275ch17326ah8275dh186M8275bh34b0iz2dh93h2a8h654h683h839ha12h1288h12a5h12bdh137ah13eah1441h1504h1537h153bh162dh1631h1758h18e1h34h1155h)
X-Forefront-Antispam-Report-Untrusted: CIP:80.75.68.251;KIP:(null);UIP:(null);(null);H:gdhostexc01.grahams.co.uk;R:internal;EFV:INT
Received: from mail132-ch1 (localhost.localdomain [127.0.0.1]) by mail132-ch1
 (MessageSwitch) id 1359435907562906_26366; Tue, 29 Jan 2013 05:05:07 +0000
 (UTC)
Received: from CH1EHSMHS012.bigfish.com (snatpool2.int.messaging.microsoft.com
 [10.43.68.235])      by mail132-ch1.bigfish.com (Postfix) with ESMTP id
 7EC8F22047B      for <lindsay.moyes@grahamsdairy.onmicrosoft.com>; Tue, 29 Jan
 2013 05:05:07 +0000 (UTC)
Received: from AM1EHSNDR002.bigfish.com (213.199.180.166) by
 CH1EHSMHS012.bigfish.com (10.43.70.12) with Microsoft SMTP Server (TLS) id
 14.1.225.23; Tue, 29 Jan 2013 05:05:06 +0000
Received: from am1outboundpool.messaging.microsoft.com (10.3.201.238) by
 AM1EHSNDR002.bigfish.com (10.3.204.16) with Microsoft SMTP Server (TLS) id
 14.1.225.23; Tue, 29 Jan 2013 05:05:05 +0000
Received: from mail77-am1-R.bigfish.com (10.3.201.245) by
 AM1EHSOBE012.bigfish.com (10.3.207.134) with Microsoft SMTP Server id
 14.1.225.23; Tue, 29 Jan 2013 05:05:05 +0000
Received: from mail77-am1 (localhost [127.0.0.1])      by mail77-am1-R.bigfish.com
 (Postfix) with ESMTP id EE6E63600B2      for
 <lindsay.moyes@grahamsdairy.onmicrosoft.com.FOPE.CONNECTOR.OVERRIDE>; Tue, 29
 Jan 2013 05:05:04 +0000 (UTC)
Received: from mail77-am1 (localhost.localdomain [127.0.0.1]) by mail77-am1
 (MessageSwitch) id 1359435901785065_29217; Tue, 29 Jan 2013 05:05:01 +0000
 (UTC)
Received: from AM1EHSMHS007.bigfish.com (unknown [10.3.201.247])      by
 mail77-am1.bigfish.com (Postfix) with ESMTP id B31C91C0074      for
 <lindsay.moyes@grahamsdairy.onmicrosoft.com>; Tue, 29 Jan 2013 05:05:01 +0000
 (UTC)
Received: from gdhostexc01.grahams.co.uk (80.75.68.251) by
 AM1EHSMHS007.bigfish.com (10.3.207.107) with Microsoft SMTP Server id
 14.1.225.23; Tue, 29 Jan 2013 05:04:57 +0000
From: <postmaster@grahamsfamilydairy.com>
To: <Lindsay.Moyes@grahamsfamilydairy.com>
Date: Tue, 29 Jan 2013 05:04:52 +0000
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
      boundary="9B095B5ADSN=_01CDF786CC9004E200060BBEgdhostexc01.grah"
X-DSNContext: 7ce717b1 - 1418 - 00000004 - C00402D1
Message-ID: <0xgy9NYb10000051c@gdhostexc01.grahams.co.uk>
Subject: Delivery Status Notification (Delay)
X-FOPE-CONNECTOR: Id%0$Dn%*$RO%0$TLS%0$FQDN%$TlsDn%
X-FOPE-CONNECTOR: Id%0$Dn%GRAHAMSDAIRY.ONMICROSOFT.COM$RO%1$TLS%0$FQDN%$TlsDn%
Return-Path: <>
X-MS-Exchange-Organization-SCL: 1
X-MS-Exchange-Organization-AVStamp-Mailbox: MSFTFF;1;0;0 0 0
X-MS-Exchange-Inbox-Rules-Loop: Lindsay.Moyes@grahamsfamilydairy.com
X-MS-Exchange-Organization-AuthSource:
 DBXPRD0710HT002.eurprd07.prod.outlook.com
X-MS-Exchange-Organization-AuthAs: Anonymous
X-OriginatorOrg: grahamsfamilydairy.com

any help is appreciated.

Regards