Question : Configuring Sendmail to relay

Greetings,

We currently have several servers setup to send out emails through our local mail server using relay. We are now moving to a different mail server that will be outside our LAN. I am trying to setup sendmail to relay emails through this new server.

Here's what I've done:

1) in sendmail.cf changed "DSlocal.server.com"  to "DSsmtp.someserver.net"

2) /etc/init.d/sendmail stop
/etc/init.d/sendmail start

Now, I am trying to send a test email:

mailx [email protected]
Subject:  whatever
.
EOT


/var/log/syslog gives me the following error:


Nov 25 16:46:59 unixbox sendmail[5398]: [ID 801593 mail.info] mAPLkxb05398: from=root, size=59, class=0, nrcpts=1, msgid=<200811252146.mAPLkxb05398@unixbox.local.com>, elay=root@localhost

Nov 25 16:46:59 unixbox sendmail[5400]: [ID 801593 mail.info] mAPLkxb05398: [email protected], ctladdr=root (0/1), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=120059, relay=smtp.someserver.net, dsn=4.0.0, stat=Deferred: Name server: smtp.someserver.net: host name lookup failure

Can anyone suggest how to fix this?

Answer : Configuring Sendmail to relay

I temporarily fixed the problem by adding my ISP's dns server address to resolv.conf. I'm suspecting there's a problem with our current DNS server.