I thought you said you had problem with only 1 domain. As Ed and Curt pointed out, you should check your SMTP logs.
But in the meantime, seems to me the first error message with SMTP status code of 5.7.1, most likely is caused by their secondary server that either has its SMTP port closed (no SMTP service is running on it) or is being blocked by the firewall. The second one, from what I've checked, could be due to the fact that they have duplicate MX records (same hostname, same IP address). This means your server is perhaps trying to deliver email to the same IP address more than once and is getting confused. In both cases, I believe the problem is on their end, not yours. Alex -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Tony Nguyen Sent: Thursday, October 26, 2006 2:09 PM To: Exchange Discussions Subject: RE: Still looking Sorry about that. Event ID: 4000 Description: Message delivery to the remote domain 'senioraerospace.com' failed. The error message is 'An SMTP protocol error occurred. '. The SMTP verb which caused the error is 'RCPT'. The response from the remote server is '550 5.7.1 Unable to relay for [EMAIL PROTECTED] '. Event ID: 4001 Message delivery to the remote domain 'senioraerospace.com' failed. The error message is 'An SMTP protocol error occurred. '. The SMTP verb which caused the error is 'RCPT'. The response from the remote server is '550 5.1.1 <[EMAIL PROTECTED]>... User unknown '. I know that these domain are valid because we email them all the time before this happen. Thank Tony -----Original Message----- From: Ed Crowley [MVP] [mailto:[EMAIL PROTECTED] Sent: Thursday, October 26, 2006 10:28 AM To: Exchange Discussions Subject: RE: Still looking You're expecting us to look up the codes ourselves because you're too lazy to use the little "copy" button in the event log message and then paste it into your message? That's going to fly well. Ed Crowley MCSE+Internet MVP Freelance E-Mail Philosopher Protecting the world from PSTs and Bricked Backups!T -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Tony Nguyen Sent: Thursday, October 26, 2006 10:16 AM To: Exchange Discussions Subject: RE: Still looking I was looking at the Event Viewer and there is a lots of warning from Source: SMTPVC with Event ID: 4001 and 4000. -----Original Message----- From: Chris Scharff [mailto:[EMAIL PROTECTED] Sent: Thursday, October 26, 2006 10:06 AM To: Exchange Discussions Subject: RE: Still looking Exchange uses DNS to route. If it's trying a lower preferenced MX record there is a reason. The first pace to look for a problem is "SURPRISE" the SMTP PROTOCOL LOGS. If there is no entry for the primary then you need to look at other network connectivity potential issues. > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:bounce- > [EMAIL PROTECTED] On Behalf Of Tony Nguyen > Posted At: Thursday, October 26, 2006 11:35 AM Posted To: swynk > Conversation: Still looking > Subject: RE: Still looking > > How would I do the SMTP connector in EXCH just for this domain to > always use the address of their primary server? I did the DNS flush but > still the same. > > -----Original Message----- > From: Alex Alborzfard [mailto:[EMAIL PROTECTED] > Sent: Thursday, October 26, 2006 8:13 AM > To: Exchange Discussions > Subject: RE: Still looking > > > Based on my test their secondary server is a problem. > It refuses SMTP connections and is also blacklisted on 5 different > lists. > > I think your EXCH box is trying the secondary server first, it can't > connect and then tries the second one and it goes through. > You can try flushing your DNS cache or perhaps add a SMTP connector in > EXCH just for this domain to always use the address of their primary > server. > > Alex > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of > Tony Nguyen > Sent: Thursday, October 26, 2006 10:57 AM > To: Exchange Discussions > Subject: RE: Still looking > > How would I check this? > > -----Original Message----- > From: John Aldrich [mailto:[EMAIL PROTECTED] > Sent: Thursday, October 26, 2006 7:47 AM > To: Exchange Discussions > Subject: RE: Still looking > > > Maybe it's a problem with their backup mail server? Since it only > happens on ONE domain, I'd guess it's on the remote side of things. > That's my personal opinion. > John > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of > Tony Nguyen > Sent: Thursday, October 26, 2006 10:37 AM > To: Exchange Discussions > Subject: RE: Still looking > > There is one only domain that I seem to have problem with and I keep > get this error. Sometime it would go through. I have check everywhere > and not sure where else to check. > > Reporting-MTA: dns;mail.jetproducts.com > Received-From-MTA: dns;sfjpd_2b.jetproducts.com > Arrival-Date: Thu, 26 Oct 2006 07:22:48 -0700 > > Final-Recipient: rfc822;[EMAIL PROTECTED] > Action: failed > Status: 5.7.1 > Diagnostic-Code: smtp;550 5.7.1 Unable to relay for > [EMAIL PROTECTED] > > > > -----Original Message----- > From: Chris Scharff [mailto:[EMAIL PROTECTED] > Sent: Wednesday, October 25, 2006 11:41 AM > To: Exchange Discussions > Subject: RE: Still looking > > > What do your SMTP protocol logs say? > > > -----Original Message----- > > From: [EMAIL PROTECTED] [mailto:bounce- > > [EMAIL PROTECTED] On Behalf Of Tony Nguyen > > Posted At: Wednesday, October 25, 2006 11:23 AM Posted To: swynk > > Conversation: Still looking > > Subject: RE: Still looking > > > > If our ISP is listed would this happen when sending email? > > > > I would send an email and it would could back with Unknown User and > > then I re-send it again and it would get through just fine. Sometime > it > > would say relay access denied and then I would re-send and it would > > work just fine. > > How can I check to see if I am using my SMTP service to sent email > out? > > > > Thank > > Tony > > > > > > -----Original Message----- > > From: Albert Duro [mailto:[EMAIL PROTECTED] > > Sent: Thursday, October 19, 2006 7:50 PM > > To: Exchange Discussions > > Subject: Re: Still looking > > > > > > It looks to me like you're sending out to a large list, some of which > > are getting bounced. Is that right? > > > > Like Dean says, you have to investigate each of the rejecting > servers. > > Although in case of the 'relay denied' bounce, they may all have a > > common cause, such as: > > > > -you or your ISP may be RBL listed > > -you may not have, or not properly have, reverse lookup -some of the > > senders/repliers may be sending from a non-routable address, like > > [EMAIL PROTECTED] > > > > etc... > > > > > > ----- Original Message ----- > > From: "Dean Cunningham" <[EMAIL PROTECTED]> > > To: "Exchange Discussions" <[email protected]> > > Sent: Thursday, October 19, 2006 4:26 PM > > Subject: RE: Still looking > > > > > > Yep, but the actual one that includes the text: > > > > smtp;550 5.7.1 Unable to relay > > or > > smtp;554 <[EMAIL PROTECTED]>: Relay access denied or smtp;550 5.1.1 > > <[EMAIL PROTECTED]>... User unknown > > > > working backwards through the headers you can trace back which > machines > > the email passed through and identify the possible server causing the > > problem > > > > for the example below (which is your reply to me from this list) we > can > > see that: > > > > It was sent from the list by intm-dl.sparklist.com ([64.62.197.83]) > It > > was received by by a202-36-175-99.(none) (our firewall) It was passed > > on to our AV SMTP gateway nrc15.nrc.govt.nz (Clearswift SMTPRS 5.2.5) > > It was then passed onto our exchange server nrc86.nrc.govt.nz > > > > Once we can identify the sever where the "unable to relay " error > came > > from , then we can work in more detail with that server. > > > > > > Microsoft Mail Internet Headers Version 2.0 > > Received: from nrc15.nrc.govt.nz ([202.36.175.39]) by > nrc86.nrc.govt.nz > > with Microsoft SMTPSVC(6.0.3790.0); > > Fri, 20 Oct 2006 11:37:36 +1300 > > Received: from a202-36-175-99.isd (unverified) by nrc15.nrc.govt.nz > > (Clearswift SMTPRS 5.2.5) with SMTP id > > <[EMAIL PROTECTED]> for <[EMAIL PROTECTED]>; > > Fri, 20 Oct 2006 11:37:31 +1300 > > Received: from intm-dl.sparklist.com ([64.62.197.83]) by > > a202-36-175-99.(none); Fri, 20 Oct 2006 11:37:29 +1300 (NZDT) > > Message-ID: <snip> > > From: Tony Nguyen <[EMAIL PROTECTED]> > > To: "Exchange Discussions" <[email protected]> > > Subject: RE: Still looking > > Date: Thu, 19 Oct 2006 15:31:35 -0700 > > MIME-Version: 1.0 > > X-Mailer: Internet Mail Service (5.5.2653.19) > > Content-Type: text/plain; charset="iso-8859-1" > > X-OriginalArrivalTime: 19 Oct 2006 22:26:20.0296 (UTC) > > FILETIME=[99ED7880:01C6F3CD] > > List-Unsubscribe: > <mailto:[EMAIL PROTECTED]> > > List-Subscribe: <mailto:[EMAIL PROTECTED]> > > X-List-Host: swynk.com discussion lists- ls.swynk.com > > <http://www.swynk.com> > > Reply-To: "Exchange Discussions" <[email protected]> > > X-Message-Id: <[EMAIL PROTECTED]> > > Sender: [EMAIL PROTECTED] > > Return-Path: [EMAIL PROTECTED] > > > > > ********************************************************************** > > Have you clicked on yet? > > www.nrc.govt.nz > > > ********************************************************************** > > NORTHLAND REGIONAL COUNCIL > > > > This email and any files transmitted with it are confidential and > > intended solely for the use of the individual or entity to whom they > > are addressed. 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Attn: Discussion List Management 475 Park Avenue South New York, NY 10016 Please include the email address which you have been contacted with. _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Web Interface: http://intm-dl.sparklist.com/read/?forum=exchange To subscribe: http://e-newsletters.internet.com/discussionlists.html/ To unsubscribe send a blank email to [EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED] To unsubscribe via postal mail, please contact us at: Jupitermedia Corp. Attn: Discussion List Management 475 Park Avenue South New York, NY 10016 Please include the email address which you have been contacted with. _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Web Interface: http://intm-dl.sparklist.com/read/?forum=exchange To subscribe: http://e-newsletters.internet.com/discussionlists.html/ To unsubscribe send a blank email to [EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED] To unsubscribe via postal mail, please contact us at: Jupitermedia Corp. Attn: Discussion List Management 475 Park Avenue South New York, NY 10016 Please include the email address which you have been contacted with. _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Web Interface: http://intm-dl.sparklist.com/read/?forum=exchange To subscribe: http://e-newsletters.internet.com/discussionlists.html/ To unsubscribe send a blank email to [EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED] To unsubscribe via postal mail, please contact us at: Jupitermedia Corp. Attn: Discussion List Management 475 Park Avenue South New York, NY 10016 Please include the email address which you have been contacted with. _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Web Interface: http://intm-dl.sparklist.com/read/?forum=exchange To subscribe: http://e-newsletters.internet.com/discussionlists.html/ To unsubscribe send a blank email to [EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED] To unsubscribe via postal mail, please contact us at: Jupitermedia Corp. Attn: Discussion List Management 475 Park Avenue South New York, NY 10016 Please include the email address which you have been contacted with.
