problem removing user

[Corne]

I am running kolab 2.0.3

I have successfully removed a user from the web interface a couple of weeks 
ago but this staff member was reemployed yesterday, Now the problem is that I 
am able to create the user but I can't send mail to the user.

I have exported that LDAP database and the cyrus database and the user is in 
there and all the parameters is correct, I have checked that the users 
directory is created in /kolab/var/imapd/spool/domain/$domain/users/ and it 
is there but when I try to send to this user the mail gets deferred by 
postfix with the following error:

Nov 30 09:03:27 kolab.man-sa.co.za <info> postfix/pipe[18996]: ACAC11CC047: 
to=<user at domain.com>, relay=kolabmailboxfilter, delay=0, status=bounced 
(service unavailable. Command output: Failed to set recipient: Invalid 
response code received from server, code 550 )

What else can I look at ?

TIA 
Corne