OU Help Desk
Kresge Library, Room 202
100 Library Drive
Rochester, MI 48309-4479
(map)
(248) 370-4357 (HELP)
Fax: (248) 370-4863
csits@oakland.edu
Office Hours: M-F 8:00am - 5:00pm

Classroom support summer hours:
Monday-Thursday 7:30 a.m. - 8 p.m.
Friday 7:30 a.m. - 6 p.m.
Saturday 8 a.m. - 2:30 p.m.
(248) 370-2461

Errors Sending E-mail to Oakland University

Errors Sending Email to Oakland Univeristy


Footprints Public Solution #31115 Updated March 2016


Oakland University has implemented a policy to conform to documentation that prohibits accepting email from misconfigured mail servers. The restriction is that the host which connects to Oakland's Mail server MUST have a reverse DNS entry and a forward DNS entry and that they match.

You may see a message that resembles the following if your mail is being refused:

"450 Client host rejected: cannot find your hostname, [111.111.111.111]"

The solution to this issue is to properly configure the mail server of the remote user by contacting the remote host. An example of a properly and mis-configured mail server is following:

1.1.1.1 resolves to mail.company.com which resolves to 1.1.1.1 (OK)

1.1.1.2 resolves to www.company.com which resolves to 1.3.4.5 (NOT ok) 1.3.4.5 doesn't resolve to anything (NXDOMAIN, NOT OK)

Please contact the helpdesk and/or the postmaster account in the remote domain. Internet standards REQUIRE that there be someone listening to postmaster@company.com email addresses.