I'm trying to configure sendmail on Centos 5 so that all mail goes through another SMTP server. In this case, it happens to be an Exchange Server. I've edited the sendmail.mc file with this line:
But when I try to send an e-mail, I get the following error:
Nov 2 14:02:00 COMPUTERNAME sendmail: oA2K1xht001368: to=<firstname.lastname@example.org>, ctladdr=<email@example.com> (0/0), delay=00:00:01, xdelay=00:00:00, mailer=relay, pri=120355, relay=10.1.1.30, dsn=5.1.2, stat=Host unknown (Name server: 10.1.1.30: host not found)
The box 10.1.1.30 is accessible from the box I am sending mail from. Meaning, I can ping 10.1.1.30 and get good responses. So I don't understand why sendmail can't find the host. Any ideas? Thanks.