Hello, I have one user, that when he tries to send to a particular Russian domain, he gets this error: You do not have permission to send to this recipient. For assistance, contact your system administrator. <BANE.quinton.com #5.7.1 smtp;551 5.7.1 we do not relay> The weird thing about it is that he is VPN'd into the corporate network, sending the mail through the company's exchange server. At first, I had to assign a reverse DNS entry into our DNS servers, since we had just readdressed our external facing devices, but this one truly baffles me. Any ideas??? Thanks much,