Hi All: I'd love some advice as I'm running out of ideas. I've been attempting to set up a second mail server as a backup and, for the life of me, I cannot understand why it won't relay messages through port 25 (smtp). I've checked iptables -- I even flushed all iptable rules just to test -- then I added explicit "ACCEPT" rules to tcp and udp port 25 in iptables. For some reason, this machine (running redhat 8 with sendmail) will send/relay, and receive both internal and external email if I use pine or mail. However, if I use a browser client like mozilla or outlook, relaying is automatically denied -- yet the maillog posts no message as to why it's denied. I'm pretty sure I set outgoing server correctly in the browser: "mail.domain.com" and I added "domain.com" to my access.db along with the network IP address (then ran makemap and restarted sendmail). Furthermore, I activated telnet and tried to "telnet mail.domain.com 25" and the connection was refused (yet standard telnet to port 23 was accepted). I"m thinking it might be something in sendmail.cf, but I'm not sure. Can anyone think of some obvious things which might be blocking relay? I'm fresh out. Thanks! Garrett _______________________________________________ TCLUG Mailing List - Minneapolis/St. Paul, Minnesota http://www.mn-linux.org tclug-list at mn-linux.org https://mailman.real-time.com/mailman/listinfo/tclug-list