Thanks Rich, Here is the messages come from these sent mails like you requested. Okay here are the mails I receive. And the maillogs on lurch.prod.oclc.org all say (OK) Your message did not reach some or all of the intended recipients. From "System Administrator" Subject: Test01 Sent: 4/29/2002 12:46 PM The following recipient(s) could not be reached: [log in to unmask] on 4/29/2002 12:46 PM The recipient name is not recognized The MTS-ID of the original message is: c=us;a= ;p=oclc;l=OA1-SERVER0204291646JXR7KB8W MSEXCH:IMS:OCLC:Dublin:OA1-SERVER 0 (000C05A6) Unknown Recipient and Your message did not reach some or all of the intended recipients. Subject: Test01 Sent: 4/29/2002 12:46 PM The following recipient(s) could not be reached: [log in to unmask] on 4/29/2002 12:46 PM The recipient name is not recognized The MTS-ID of the original message is: c=us;a= ;p=oclc;l=OA1-SERVER0204291646JXR7KB8V MSEXCH:IMS:OCLC:Dublin:OA1-SERVER 0 (000C05A6) Unknown Recipient and from [log in to unmask] ---- Failed Recipients ---- <[log in to unmask]> Host not found. ---- Contents of the undelivered mail ---- Received: FROM oa1-server.oa.oclc.org BY mshieldserver1.oclc.org ; Mon Apr 29 12:46:12 2002 -0400 Received: by oa1-server.oa.oclc.org with Internet Mail Service (5.5.2653.19) id <JXR7KB84>; Mon, 29 Apr 2002 12:46:12 -0400 Message-ID: <[log in to unmask]> From: "Summanen,Jack" <[log in to unmask]> To: "[log in to unmask]" <[log in to unmask]>, "[log in to unmask]" <[log in to unmask]>, "[log in to unmask]" <[log in to unmask]> Subject: Test01 Date: Mon, 29 Apr 2002 12:46:11 -0400 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" do you read me? The Subscription message is from user: [log in to unmask] the body reads: Opensource -- confirmation of subscription -- request 103186 We have received a request from 132.174.211.86 for subscription of your email address, <[log in to unmask]>, to the [log in to unmask] mailing list. To confirm the request, please send a message to [log in to unmask], and either: - maintain the subject line as is (the reply's additional "Re:" is ok), - or include the following line - and only the following line - in the message body: confirm 103186 (Simply sending a 'reply' to this message should work from most email interfaces, since that usually leaves the subject line in the right form.) If you do not wish to subscribe to this list, please simply disregard this message. Send questions to [log in to unmask] a reply to this user generates: from System Administrator Your message did not reach some or all of the intended recipients. Subject: RE: Opensource -- confirmation of subscription -- request 103186 Sent: 4/29/2002 12:53 PM The following recipient(s) could not be reached: [log in to unmask] on 4/29/2002 12:53 PM The recipient name is not recognized The MTS-ID of the original message is: c=us;a= ;p=oclc;l=OA1-SERVER0204291652JXR7KC2J MSEXCH:IMS:OCLC:Dublin:OA1-SERVER 0 (000C05A6) Unknown Recipient . Known Aliased users for the listserv are: opensource opensource-admin opensource-request opensource-owner You can generate some of these by subscribing at: http://www.sitesearch.oclc.org/mailman/listinfo/opensource -----Original Message----- From: Rich Greenberg [mailto:[log in to unmask]] Sent: Monday, April 29, 2002 10:37 AM To: [log in to unmask] Subject: Re: advise On: Mon, Apr 29, 2002 at 08:16:57AM -0400,Humphrey,Mindy Wrote: } Can anyone point me in the right direction, regarding this problem } } I can send e-mails from the server. } } But when a test user tries to subscribe to a listserv They do receive a } confirmation e-mail. their subscription does not get activated until they } respond to the e-mail. When the e-mail reply is sent, the Exchange server } claims the recipient is unknown. (The machine that is hosting the listserv } is internally lurch.prod.oclc.org and externally is called } www.sitesearch.oclc.org and sitesearch.oclc.org) I think the probem may be } with the Exchange server's aliases file? } } the logs I have of the transaction are below (I tried this with the listserv } aliases and with an existing user "Summanen" on the server) sendmail is } getting no errors (neither is the listserver software (mailman)). I have no } access the exchange server so I cannot track the error response any } closer...:( Try sending mail from an outside point to various addresses such as: [log in to unmask] [log in to unmask] /* This one probably shouldn't work*/ [log in to unmask] And see what gets thru. Which address are they using on the subscribe request? -- Rich Greenberg Work: Rich.Greenberg atsign worldspan.com +1 770-563-6656 N6LRT Marietta, GA, USA Play: richgr atsign panix.com +1 770-321-6507 Eastern time zone. I speak for myself & my dogs only. VM'er since CP-67 Canines:Val(Chinook,CGC,TT), Red & Shasta(Husky,(RIP)) Owner:Chinook-L Atlanta Siberian Husky Rescue. www.panix.com/~richgr/ Asst Owner:Sibernet-L