Dear Friend,
I have Exchange2003 Srv. with SP2.
When I send an e-mail to one of my customer, I get the error message below:

#######################
The following recipient(s) could not be reached:

on 13.02.2006 15:11

You do not have permission to send to this recipient. For
assistance, contact your system administrator.

mail.my_company.COM #5.7.1 smtp;550 5.7.1
... recipient denied, because MX 10
'mail.my_company.com.' [212.xxx.xxx.xxx] for
rejected address saying "Only 0 recipient allowed for sender ''"

#######################


Is there anyone who can help me, please?
Regards,

Capricorn