Say we have a customer whose domain name is abcd.com, therefore all mail coming from their domain is username@xxxxxxxxx Within this customer's site, they have a unix server in a sub-domain called server.company.abcd.com . It became necessary to send mail from the unix server to a vendor outside their domain. Therefore, we created a custom recepient with the outside company's address and made it a member of a distribution list so the unix server could send the mail to a local email address, it would then go to the custom recepient. The problem is that the vendor who receives the email put in place a spam filter that looks at the header and tries to resolve back to server.company.abcd.com . When it doesn't, the spam software blocks the mail. Does anyone have any ideas around this. Personally, I think it's up to the vendor's ISP to allow the mail as it is legitimate, but I'm willing to listen to other ideas... Thanks! Paul Maglinger