Email Rejected

Hello Everyone,  I can not figure out for the life of me. It has been couple of months now. One of our vendor is trying to send us email and they get a bouce back with a following message. He is able to send emails to everyone else. Its just us that he can not send a email to. He is able to receive email from us no problems. I have Postini filtering my email and I have called them and added their domain  name to the exception list. Postini technical support checked out their settings and said that traffic is passing through their servers . I have Exchange server 2003 and a Watchguard firewall E750. I don't have any problems receiving emails from anybody else.  My vendor also have called their service provider and they claim that they are not blocking any emails coming to us. It seems like email is coming to us and being rejected either at postini which they claim that it is not or at my firewall or exchange server. I have complete trust in your abilty to give me an asnswer. I have always been able to get a solution from you guys. Thank you very much in advance for all your help.



Reporting-MTA: dns; QMTA06.westchester.pa.mail.comcast.net [76.96.62.56]

Received-From-MTA: dns; OMTA01.westchester.pa.mail.comcast.net [76.96.62.11]

Arrival-Date: Wed, 29 Apr 2009 14:57:03 +0000

 

 

Final-recipient: rfc822; usename@domainname.com

Action: failed

Status: 5.1.1

Diagnostic-Code: smtp;  550 Requested action not taken: mailbox unavailable

Last-attempt-Date: Wed, 29 Apr 2009 14:57:07 +0000

 


Reporting-MTA: dns; QMTA06.westchester.pa.mail.comcast.net [76.96.62.56]
 
Received-From-MTA: dns; OMTA01.westchester.pa.mail.comcast.net [76.96.62.11]
 
Arrival-Date: Wed, 29 Apr 2009 14:57:03 +0000
 
 
 
 
 
Final-recipient: rfc822; fnunez@bricolagedesigns.com
 
Action: failed
 
Status: 5.1.1
 
Diagnostic-Code: smtp;  550 Requested action not taken: mailbox unavailable
 
Last-attempt-Date: Wed, 29 Apr 2009 14:57:07 +0000

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mattkiranAsked:
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MesthaCommented:
The message means what it says. The mailbox is not available on the server the message is being delivered to.
What it does NOT mean is that the connection is being made to the correct server. As there is an ISP involved, neither you nor the sender can diagnose this. The ISP needs to do that, as they have access to the server. They need to do an MX record lookup and verify it matches with the correct records.

Simon.
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Alan HardistyCo-OwnerCommented:
Totally agree with Simon - if only I was not answering another question first, I would have said just that.
Has your user been setup on the Postini server?  It sounds like they have not and should be.  Get them setup and test.
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mattkiranAuthor Commented:
Thank you for the quick response. Yes the user is setup on postini and also on my server. he gets emails from everyone else. There is no issue there. Only this particular sender. They don't host their emails . It is hosted by a ISP. Accoring to their ISP its not them. They ran their tests.  I can not figure it out. Can I run some checks on my end.
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Alan HardistyCo-OwnerCommented:
You can try testing using telnet from a command prompt.
Start, run, cmd (enter).
telnet server 25
Follow the guidelines on the correct formatting / commands to use in this document:
http://support.microsoft.com/kb/153119 
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mattkiranAuthor Commented:
Thank you . I will try it right now. So you don't think the problem is on my side.
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Alan HardistyCo-OwnerCommented:
I just tested using telnet to their server and it came back - "No Such User".
That's pretty conclusive and all MX records point to Postini.
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mattkiranAuthor Commented:
Thank you very much.
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