I setup a Ubuntu server to work as Hylafax server and PostFix SMTP server in order to let me sending fax through Email. I want to send email to fax by using Outlook. The Exchange is my primary server and all Outlook is configured to access mailbox in Exchange. Now, I tried to send something like [email protected], I got the following bounce back message. Generating server: FaxOutlook.company.fax [email protected] #< #5.4.6 X-Postfix; mail for faxoutlook.company.fax loops back to myself> #SMTP# Apparently, the Exchange can forward my email to this smtp server faxoutlook.company.fax but somehow; it cannot be routed to Hylafax. Please help