There is not an actual hostname for umd.edu assigned for a variety of reasons, but there are MX records for umd.edu which is why everything works fine. I have not seen a mailer before reject mail for this reason. If you do a host -a you will see the MX records for it.
-----Original Message----- From: UM Linux User's Group [mailto:[EMAIL PROTECTED] On Behalf Of Judah Milgram Sent: Monday, January 15, 2007 8:58 AM To: [email protected] Subject: [UM-LINUX] "umd.edu" doesn't resolve? very odd thing ... I just lost two emails from someone with an [EMAIL PROTECTED] address because sendmail couldn't resolve his domain: (name x'd to protect the innocent) reading message [EMAIL PROTECTED]:3 of 23 (2354 header octets) ..fetchmail: SMTP error: 553 5.1.8 <[EMAIL PROTECTED]>... Domain of sender address [EMAIL PROTECTED] does not exist flushed reading message [EMAIL PROTECTED]:4 of 23 (2327 header octets) ..fetchmail: SMTP error: 553 5.1.8 <[EMAIL PROTECTED]>... Domain of sender address [EMAIL PROTECTED] does not exist flushed a quick check: mite:~: host umd.edu Host umd.edu not found: 3(NXDOMAIN) and verified it on another machine. That's can't be right - or?! Anyone else having this sort of problem? Meanwhile, I turned on accept_unresolvable_domains. Judah
