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

Classroom support hours:
Monday-Thursday 7:30 a.m. - 8 p.m.
Friday 7:30 a.m. - 6 p.m.
Saturday 8 a.m. - 5 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, []"

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: resolves to mail.company.com which resolves to (OK) resolves to www.company.com which resolves to (NOT ok) 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.