If "telnet mail.yourdomain.com 25" gives a connection refused, then it's either a firewall issue, or Sendmail is not listening on port 25 for mail.domain.com (I've seen some unixes start a local-only Sendmail on port 25, so it only accepts connections from/to "localhost:25" Check how sendmail is started in your start-up scripts, or see what the actual command-line was in /proc (or does Sendmail change this.../) If telnet mail.domain.com 25 gives you the SMTP banner, and you get "relaying denied" from Sendmail while trying to actually send a message, then you need to tell Sendmail to relay mail for the domain you're trying to be backup for. This may be /etc/mail/relay-domains, you can see what your distro calls it by grepping for "FR-o" in your sendmail.cf (assuming it's configured to use a file), or "cR-o" if it doesn't use a file (i.e., they are specified in your sendmail.mc file). If it's a Sendmail issue and not a firewall/IPtables issue, contact me off list and I can provide some more help if needed (include your sendmail.cf). Adam Maloney Groks Sendmail Rulesets :) Sihope Communications On Sat, 11 Oct 2003, gkrueger wrote: > 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 > _______________________________________________ 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