Outlook 2003 POP 3 relay issues with Exchange 2010
Posted on 2011-03-02
I have migrated my Exchange 2007 server to 2010, everything is working fine except some of my outlook 2003 pop 3 connections are getting 550 5.7.1 Unable to relay when they some to external domains other than yahoo, hotmail. I have checked that anonymouse authentication is selected .. outlook 2007 pop3 are working fine. please advise.