Well Mike, I hate to be the bearer of bad news, but both of the recipient organizations are on the FiveTen RBL.
Checked both glencap.com and versaggi.com against www.SamSpade.org. So if your servers are checking the destination address against RBL's before sending, would you get an error similiar to that? I don't know. Jim -----Original Message----- From: Mike Anderson [mailto:[EMAIL PROTECTED] Sent: Wednesday, May 28, 2003 9:43 PM To: Exchange Discussions Subject: RE: Unknown User problems (help!) Hi Ed, The first thing I checked was Reverse DNS - it's absolutely perfect - I even checked it using remote systems - and DNS verifiers. Rock and Roll. As far as Black Lists - I will check ORBS and a couple others - but this is a Capital Management company - nothing but first class people (and business practices) and they never did a mass mail in their lives - so I just can't fathom them being on any type of list. Ok - just checked it - they are on NO blacklists. It's possible they are lumping this particular error message with all the other crap they are throwing at us - saying, that it's happening more than once. I *know* the unknown user error is happening often - and that's my #1 concern right now. I really don't feel that the other problem mentioned above is happening often at all. Today is the first I heard of that particular one. Now regarding the NDR (for the Unknown User error) - here it is: > Unknown user: [EMAIL PROTECTED] > > > Original message follows. > > Received: from UltimaThule [66.73.199.56] by clovisinc.com with ESMTP > (SMTPD32-6.06) id A9944C510150; Mon, 26 May 2003 15:31:16 -0500 > Message-ID: <[EMAIL PROTECTED]> > From: <[EMAIL PROTECTED]> > To: "Kim Kolesar" <[EMAIL PROTECTED]> > Cc: "Matt Versaggi" <[EMAIL PROTECTED]> > Subject: Fw: Undeliverable Mail > Date: Mon, 26 May 2003 15:31:14 -0500 > MIME-Version: 1.0 > Content-Type: text/plain; > charset="iso-8859-1" > Content-Transfer-Encoding: 7bit > X-Priority: 3 > X-MSMail-Priority: Normal > X-Mailer: Microsoft Outlook Express 6.00.2800.1106 > X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 If anybody has any ideas, or anything I should check, please let me know. Thanks, Mike -----Original Message----- From: Ed Crowley [mailto:[EMAIL PROTECTED] Sent: Wednesday, May 28, 2003 10:24 PM To: Exchange Discussions Subject: RE: Unknown User problems (help!) Please post the entire NDR. In response to the second question, it appears that your server is being rejected. Two reasons this might occur is that you don't have a valid reverse DNS (PTR) entry, or you are on one or more realtime blackhole lists (RBLs). Ed Crowley MCSE+I MVP "There are seldom good technological solutions to behavioral problems." -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mike Anderson Sent: Wednesday, May 28, 2003 6:08 PM To: Exchange Discussions Hello, Ever since we moved our business to another building down the road, and switched ISP's (with a new block of IP's), our Exchange Server has been acting up. We didn't have to change hardly anything after moving - except some IP addresses on the ISA Firewall Server's external interface, and some DNS settings on the Exchange Server (for outgoing mail DNS resolution). >From time to time, external users that are sending e-mail to users on the Exchange Box, are getting "Unknown User" error messages. This has NEVER happened before - and am desperately trying to figure out, how changing ISP's, can cause all these problems. How the heck could a remote system, get as far as opening a connection all the way to the Exchange Box, and once authenticated etc., it's unable to find a particular user on the system - when they are there plain as day??? This server has never hiccupped a single time before the move - Also, (here is another good one), on AOL and similar systems, from time to time, users that had no problem before the move, could send mail to particular users with no problems, are NOW they are getting similar error messages: > The following recipient(s) could not be reached: > [EMAIL PROTECTED] on 5/28/2003 4:37 PM > The e-mail account does not exist at the organization this > message was sent to. Check the e-mail address, or contact the > recipient directly to find out the correct address. > < rly-xg03.mx.aol.com #5.1.1 SMTP; 550 geomarxxx IS NOT ACCEPTING MAIL FROM THIS SENDER > Does anybody have ANY ideas as to what is going on here? Our client is really getting irritated - and I have been working day and night, making sure DNS is setup right, our Reverse DNS is setup right (with our new IP's), just anything else that I thought of... Thanks in advance for any information offered, Mike _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Web Interface: http://intm-dl.sparklist.com/cgi-bin/lyris.pl?enter=exchange&text_mode=&; lang =english To unsubscribe: mailto:[EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED] _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Web Interface: http://intm-dl.sparklist.com/cgi-bin/lyris.pl?enter=exchange&text_mode=&; lang=english To unsubscribe: mailto:[EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED] _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Web Interface: http://intm-dl.sparklist.com/cgi-bin/lyris.pl?enter=exchange&text_mode=&lang =english To unsubscribe: mailto:[EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED] _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Web Interface: http://intm-dl.sparklist.com/cgi-bin/lyris.pl?enter=exchange&text_mode=&lang=english To unsubscribe: mailto:[EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED]
