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SMTP - 553 mailbox is restricted

We are having issues sending external emails to a particular domain.  When attempting to send from our Exchange Server 2003 server to any user in a particular domain, we are getting bounce messages with the following error:

Received <<< 553 mailbox user@company.com is restricted (Mode: normal)

All other domains work fine on our end.  After speaking with IT on the recipient's end, they are claiming this is caused by something on our end as they aren't having difficulties with receiving messages from any other domain.  I'm not sure if it is something on my end or theirs - any assistance is appreciated.  

thanks.
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nicolehess
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nicolehess
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2 Solutions
 
Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
553 mailbox user@company.com is restricted - Clearly says that a restriction has been set by the Company.com Admins for emails to this mailbox cannot be send by either Outside domain users or just few selected. So you cant do anything in that :(

- Rancy
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nicolehessAuthor Commented:
Thanks for the quick response Rancy.  I will get back with them and see if they can investigate from their end once again.  I forgot to mention we were able to send messages to this domain at one time.  The bounce backs started when they moved to a new physical location.  I'm not sure if they changed ISPs at that time, but could the move be a contributing factor in this?  That seems too coincidental to not be...which is another reason I was thinking the issue is on their end and not mine.
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DamjanCommented:
Please read this article
Here you will find more info about this error and possible solutions.
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nicolehessAuthor Commented:
Thanks for the article on possible errors/solutions.  This reaffirms that the error is on their end and not mine.  I have forwarded the article to the admin on the recipient side.  Hopefully they find the solution to the issue.  I will post an update once I hear back from them.
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Also make sure you dont have any kind of hardcoded information IP or hostname something on your firewall servers ?

- Rancy
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