Hi, Hope someone out there can help me on this one - Its been causing me some real headaches! We have an issue currently where some messages entering our organisation end up failing with an NDR stating thata message has been bouncing between servers. The NDR is along the lines of Your message did not reach some or all of the intended recipients. Subject: [Aberdeen_Freecycle] WANTED: Cash Tray (Aberdeen) Sent: 11/06/2007 08:06 The following recipient(s) cannot be reached: Fleming, Callum - AJLx.HQ on 11/06/2007 08:10 A configuration error in the e-mail system caused the message to bounce between two servers or to be forwarded between two recipients. Contact your administrator. <ABER-SMTP-002 #4.4.6> The message above is coming from a yahoo-groups distribution list - and I also have another set of messages bouncing which come in from another distribution group (not an internal distribution list). The users in question have nothing different in their setup to the other 600 I have in the organisation. This issue has always been in existance as it isa newly migrated 2003 org (was 5.5, Inter org migration). For info inbound mail flow is as follows MessageLabs (for spam and AV scanning) ->ABER-SMTP-002 (IIS6 Relay in DMZ) ->ABER-EXCH-003(Exchange Server) It would seem that the message is bouncing between the Exchange server and the DMZ Relay server. The message header of a bounced message is as follows (ive changed the orginators email address to protect privacy) Received: from ABER-SMTP-002 ([10.113.30.222]) by aber-exch-003.ajl.co.uk with Microsoft SMTPSVC(6.0.3790.1830); Wed, 13 Jun 2007 22:37:12 +0100 MIME-Version: 1.0 Content-Type: multipart/report; report-type=delivery-status; boundary="----_=_NextPart_012_01C7AE03.0127CD60" x-mimeole: Produced By Microsoft Exchange V6.5 Return-Path: <> X-OriginalArrivalTime: 13 Jun 2007 21:37:12.0430 (UTC) FILETIME=[00C390E0:01C7AE03] X-DSNContext: 335a7efd - 2406 - 00000002 - C00402CD Content-class: urn:content-classessn Subject: Undeliverable: [Aberdeen_Freecycle] OFFERED: Coffee Table (Bucksburn) Date: Wed, 13 Jun 2007 22:37:13 +0100 Message-ID: <IWeTlhxvz0000007a@ABER-SMTP-002> X-MS-Has-Attach: yes X-MS-TNEF-Correlator: Thread-Topic: [Aberdeen_Freecycle] OFFERED: Coffee Table (Bucksburn) Thread-Index: AceuAwElFLXq+IcWQ/ii7MUMuuSmgwAAAABo From: "System Administrator" <postmaster@ajl.co.uk> To: blah@blah.com ------_=_NextPart_012_01C7AE03.0127CD60 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable ------_=_NextPart_012_01C7AE03.0127CD60 Content-Type: message/delivery-status Content-Transfer-Encoding: 7bit ------_=_NextPart_012_01C7AE03.0127CD60 Content-Type: message/rfc822 Content-Transfer-Encoding: 7bit Comment: DomainKeys? See http://antispam.yahoo.com/domainkeys MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_011_01C7AE45.7909A480" Return-Path: <sentto-13827202-3449-1181770449-c.fleming=ajl.co.uk@returns.groups.yahoo.com> x-mimeole: Produced By Microsoft Exchange V6.5 X-Mailer: 9.0 SE for Windows sub 5024 X-OriginalArrivalTime: 14 Jun 2007 05:33:01.0781 (UTC) FILETIME=[7980D050:01C7AE45] X-VirusChecked: Checked X-Env-Sender: sentto-13827202-3449-1181770449-c.fleming=ajl.co.uk@returns .groups.yahoo.com X-Msg-Ref: server-2.tower-179.messagelabs.com!1181770450!898218!1 X-StarScan-Version: 5.5.12.11; banners=-,-,ajl.co.uk X-Originating-IP: 205.188.144.208 X-SpamReason: No, hits=3.9 required=7.0 tests=ratty_date: Non-RFC but legit format in Wed, 13 Jun 2007 14:17:08 EDT\n,BODY_RANDOM_LONG, HTML_90_100,HTML_MESSAGE,HTML_TINY_FONT,MIME_HTML_MOSTLY DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=lima; d=yahoogroups.com;b=Hhh9sw79rrVj/ANgxk0mYCGjwpKzn5N6WKrr6HPhpAyNyRP1pVfw9tfnIOvLWpCBGWNOdIpMaMtFbs/csTFgWZEAX+FqZiy0iLJrKOBYq2BFb0z4/s0n1D5KoYf8mt6f; X-Yahoo-Newman-Id: 13827202-m3449 X-Sender: blah@blah.com X-Apparently-To: Aberdeen_Freecycle@yahoogroups.com X-eGroups-Msg-Info: 1:6:0:0 X-Yahoo-Profile: rbscott6 X-eGroups-Approved-By: loadingbay <sjstuff@gmail.com> via web; 13 Jun 2007 21:31:53 -0000 Mailing-List: list Aberdeen_Freecycle@yahoogroups.com; contact Aberdeen_Freecycle-owner@yahoogroups.com Delivered-To: mailing list Aberdeen_Freecycle@yahoogroups.com List-Id: <Aberdeen_Freecycle.yahoogroups.com> X-Yahoo-Newman-Property: groups-email-ff X-Spam-Flag: NO Content-class: urn:content-classes:message Subject: [Aberdeen_Freecycle] OFFERED: Coffee Table (Bucksburn) Date: Wed, 13 Jun 2007 19:17:08 +0100 Message-ID: <cea.119aa550.33a18ea4@aol.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [Aberdeen_Freecycle] OFFERED: Coffee Table (Bucksburn) Thread-Index: AceuAwElFLXq+IcWQ/ii7MUMuuSmgw== List-Unsubscribe: <mailto:Aberdeen_Freecycle-unsubscribe@yahoogroups.com> From: <RbScott6@aol.com> Sender: <Aberdeen_Freecycle@yahoogroups.com> To: <Aberdeen_Freecycle@yahoogroups.com> ------_=_NextPart_011_01C7AE45.7909A480 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable ------_=_NextPart_011_01C7AE45.7909A480 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable ------_=_NextPart_011_01C7AE45.7909A480 --------_=_NextPart_012_01C7AE03.0127CD60 ------_=_NextPart_001_01C7AE5C.ABAEE040-- Thanks in advance Paul