Allow Exchange 2010 to relay to external email address
Posted on 2012-09-18
I have configured a new Receive Connector in our Exchange 2010 (SBS2011) to allow a Voicemail application on one of our Windows 2008 R2 server to send emails (voicemails) to the internal users. It is configured with no authentication (anonymous). All works fine.
But I would also need to be able to send voicemail emails to external Internet email addresses. When I test it from Telnet, I get a relaying error from Exchange (550 5.7.1 Unable to relay) right after entering the "rcpt to:email@example.com" command. The same Telnet test to an internal user works fine. Do I need to change something in the Receive Connector to allow relaying to the Internet, or something else ?
Sequence of telnet commands I try to use when testing to external email address (I get the error 5.7.1 Unable to relay after the rcpt to: command):
(start of telnet session)
open 10.0.1.10 25
Subject: Test message from Voicemail server
This is a test message from the Voice Mail server.
(end of telnet session)