550 5.7.1 Unable to Relay Mail From Exchange Server

Open the “New SMTP Receive Connector wizard”

Click Properties of Connectors,

Click Permissions, and others,

Select annonymous


After open terminal write  this TESTED !!!




You need to do  this for     all of connectors,   PORT 25 and 587

determine public ip via linux command line terminal

Linux terminal determine public ip

other choices