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SBS Exchange - 550-No Such User Here

SBS 2003
SBS Exchange

Everytime we email one of our clients we are getting the return message.

=======================================================
This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of
its recipients. The following addresses failed:

 <bransby_test@****************.com>

SMTP error from remote server after RCPT command:
host mail.r********************s.com[7*.**.1*.3*]:
550-Verification failed for <email@***********.co.uk>
550-No Such User Here
550 Sender verify failed
======================================================

Now this has happened for a while on the odd occasion but now its happening all the time.
I rebooted the server last night and it all came flooding in (The emails that is)
0
Bransby-IT
Asked:
Bransby-IT
1 Solution
 
Hardeep_SalujaCommented:
Hi Bransbay,

Firstly, Check if recipient filtering is enabled?? If yes.. u got the answer ..

Also, in these type of cases, most probably domain for  <email@***********.co.uk> is getting blocked at ISP end. Please contact your ISP for resolution of issue

let me know if have any further queries.
Thanks
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