Hi All,
I thought I posted this yesterday, but cant seem to find it, so if its 
duplicated or been deleted for some reason, please ignore.

Basically we migrated a site from a linux mail system to an exchange mail 
system. The exchange system (2003) has its own dedicated internet connection, 
so when it went live, we simply created all of the mailboxes from the linux 
system on the 2003 system and changed the mx records for this companies domains 
to point to the 2003 mail server.

Mail started comming in and going out, no problems.

A new user then started who was only created on the 2003 exchange system. Most 
of their functionality is ok (can send and recieve to most recipients) but some 
of them do not work.

We get an 550 Verification failed error. Initially it was different, and 
related to the MX2 failing to respond, so i have since removed all traces of 
the old mail system from the host records of their domains. In spite of this, 
the errors still occur.

 There was a SMTP communication problem with the recipient's email server.  
Please contact your system administrator.
  <server01.local #5.5.0 smtp;550-Verification failed for <[EMAIL PROTECTED]>>

Its only happening sending to a handful of domains.. the majority of email is 
ok.

Any ideas would be appreciated.
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