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550 5.1.1

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550 5.1.1 - 11.Jun.2008 9:06:42 AM   
zahran

 

Posts: 3
Joined: 11.Jun.2008
Status: offline
Hi,

We have exchange 2007. External customers can not send emails to one of our accepted domains. They recieve a reply message with the following error :

" Remote host said: 550 5.1.1 . User unknown; rejecting "

How can we fix that ?

Thanks.

_____________________________

Ahmed Mostafa
Post #: 1
RE: 550 5.1.1 - 11.Jun.2008 12:56:55 PM   
Sembee

 

Posts: 4093
Joined: 17.Jan.2008
From: Somewhere near London, UK
Status: offline
The message means what it says - the user address is unknown. Does it happen with all accounts on that domain?

Simon.

_____________________________

Simon Butler,
Exchange MVP
Blog: http://blog.sembee.co.uk/
Web: http://www.amset.info/
In the UK? Hire me: http://www.sembee.co.uk/
Exchange Resources: http://exbpa.com/

(in reply to zahran)
Post #: 2
RE: 550 5.1.1 - 11.Jun.2008 2:01:06 PM   
John Weber

 

Posts: 1236
Joined: 20.Apr.2005
From: Portland, Oregon
Status: offline
Does the email address exist in your organization?
Does the smtp domain exist in your organization?

_____________________________

John Weber [Lync MVP] http://tsoorad.blogspot.com

(in reply to zahran)
Post #: 3
RE: 550 5.1.1 - 11.Jun.2008 7:07:17 PM   
hertewafik

 

Posts: 1
Joined: 11.Jun.2008
Status: offline
Hello,

i have the same problem in my organization, the accounts exists, but cannot accept emails from hotmail, yahoo, while some accounts does accept.

Thanks guys.

(in reply to John Weber)
Post #: 4
RE: 550 5.1.1 - 12.Jun.2008 3:40:17 AM   
zahran

 

Posts: 3
Joined: 11.Jun.2008
Status: offline
Hi,

Thanks for replies. I solved it. It was a DNS problem. The A record which the MX record pointing to was incorrect.

Thanks.

_____________________________

Ahmed Mostafa

(in reply to hertewafik)
Post #: 5

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