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No unauthenticated relaying permitted

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No unauthenticated relaying permitted - 21.Mar.2011 5:08:54 PM   
berryguru

 

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user@client_domain.com on 3/21/2009 8:51am
There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.  
<mail.our_company_domain.com #5.5.0 smtp;550 bosauthsmtp07: Host <our ip address>: No unauthenticated relaying permitted>"

Can I safely say the issue is on the other persons end, based on the error shown above?  Reason being is that my server is in the NDR which means my system generated the NDR. We don't have issues with any other domain except this one.  
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RE: No unauthenticated relaying permitted - 21.Mar.2011 5:33:33 PM   
mark@mvps.org

 

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From: Philadelphia PA
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If your clients were using Outlook rather than Pop/imap & smtp and the message contains something from their domain you can assume something is awry at their end.

It's not actually a problem or risk to postthe details properly. Masking stuff is counterproductive.

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(in reply to berryguru)
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RE: No unauthenticated relaying permitted - 21.Mar.2011 7:16:08 PM   
berryguru

 

Posts: 52
Joined: 18.Feb.2010
Status: offline
I always figure it's best to remove company information.  But understood.

So I sent a test email to that account and it went through, being that I received an out of office reply right away.  From what I'm told, it's the reply that is bouncing back.  Now I can surely say it's on their end.  Would you agree?

(in reply to mark@mvps.org)
Post #: 3

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