accepting your mail on port 25. =20 If so, that may eventually stop working at which point you'll need to switch to port 587. In early 2009, there was discussion on this list about Comcast blocking port 25. =20 http://archives.mn-linux.org/pipermail/tclug-list/2009-February/thread.h tml =20 I was unaffected at the time, but in February of 2010, Comcast stopped accepting my port 25 connections. =20 $ telnet smtp.comcast.net 25 Trying 76.96.30.117... telnet: Unable to connect to remote host: Connection timed out I called Comcast and they said "that's right, use port 587." =20 I can telnet to port 587, but actual use requires authentication with my Comcast credentials. =20 I've reconfigure postfix for port 587 per=20 http://www.kclug.org/pipermail/kclug/2008-February/032558.html=20 and setup SMTP Authentication per=20 http://www.freelock.com/kb/postfix-relayhost=20 but I'm stuck on the last step: # urpmi --media main libsasl2-plug-login libsasl2-plug-plain bash: urpmi: command not found Tony Yarusso gave me=20 > apt-get install libsasl2-modules (That package will provide both LOGIN and PLAIN.) The install worked, but didn't provide the=20 urpmi command on Debian with postfix 2.3.8. I've since moved to Ubuntu where apt-get says libsasl2-modules is already the newest version. If anyone can help, I would be glad to document the solution. I'm running postfix 2.7.0 and can live with out-going mail only. =20