Thanks Microsoft for this fourm. Ireturn with another problem looking for a quick and easyanswer... When outside messages aresent to this mailbox, it is returned to the sender reporting the user does not exist. I checked theexchange settings in exchange they are correct. How to diagnoes? and where to go from here. I changed my sender and the recipient address not to be flooded with emails or other attempts. ----- Transcript of session follows -----... while talking to mail.<domain...>.com.:>>> RCPT To:<user@domain.com><<< 550 <user@domain.com>: Recipient address rejected: does not exist550 <user@domain.com>... User unknown Final-Recipient: RFC822; user@domain.com Action: failed Status: 5.1.1 Remote-MTA: DNS; mail.domain.com Diagnostic-Code: SMTP; 550 <user@domain.com>: Recipient address rejected: does not exist Last-Attempt-Date: Fri, 1 Feb 2008 14:20:26 -0500 (EST) Received: from sender@aol.com by imo-d20.mx.aol.com (mail_out_v38_r9.3.) id q.c1c.2a6b99c0 (37565) for <user@domain.com>; Fri, 1 Feb 2008 14:20:23 -0500 (EST) Return-Path: <sender@aol.com> Received: from webmail-nd08 (webmail-nd08.sim.aol.com [207.200.67.93]) by cia-mb04.mx.aol.com (v121.4) with ESMTP id MAILCIAMB042-92bd47a370f6123; Fri, 01 Feb 2008 14:20:23 -0500 To: user@domain.com Subject: Friday test from AOL Date: Fri, 01 Feb 2008 14:20:23 -0500 X-MB-Message-Source: WebUI X-AOL-IP: 66.180.125.196 X-MB-Message-Type: User MIME-Version: 1.0 From: sender@aol.com Content-Type: multipart/alternative; boundary="--------MB_8CA331EA057E1A2_12C_257A_webmail-nd08.sysops.aol.com" X-Mailer: AOL Webmail 34032-STANDARD Received: from 66.180.125.196 by webmail-nd08.sysops.aol.com (207.200.67.93) with HTTP (WebMailUI); Fri, 01 Feb 2008 14:20:22 -0500 Message-Id: <8CA331EA057E1A2-12C-130F@webmail-nd08.sysops.aol.com> X-Spam-Flag: NO .AOLWebSuite .AOLPicturesFullSizeLink {height:1px;width:1px;overflow:hidden;}

You don't really explain the scenario at all, but this line indicates that the address is either misspelled or does not exist: .AOLWebSuite .AOLPicturesFullSizeLink {height:1px;width:1px;overflow:hidden;} Stephen Y wrote: Action: failedStatus: 5.1.1Remote-MTA: DNS; mail.domain.comDiagnostic-Code: SMTP; 550 <usermailto:user@domain.com"><FONT< A> color=#013da4>@domain.com>: Recipient address rejected: does not exist

Please allow me to explain. These email accounts that are already set up and have been working fine for over a year. When a business contact sends mail to them, he gets that message. I double checked the spelling in AD, under their smtp and they match. I did create another smtp first.last@domain.com and it came through which had me tripple check the spelling inside my server and where the outside person was emailing to.

Despite the triple-check you mention, i'd bet its still something simple the user is doing wrong. You can turn on protocol logging on your exchange server to get more detail. the ndr doesn't contain enough info.

While I can't declare you the winner yet, you gave me a direction. Thank You. I created my own YAHOO Email account and was able to send fine. I relayed this to the other party suggesting he delete the errored address from his dist groups, contact list and address book then re-try. I'm waiting for a responce.

haha, thanks. I don't need to "win". just let me know if there is anything else I can do to help!

The problem was,,,,, Qwest migrated us on or aboutJanuary 15th. I needed to point the DROA records to thier new site. They went from a .net to a .com....

I have a similar problem. Except it happens randomly. A user will send e-mail to the owners wife at her MSN account and there will be an exchange of replies. After 2 or 3 replies the MSN sender will recieve the 550 error. Any ideas.