I am a consulant that has recently set up an in house Exchange2003 server for a client and they are having problems sending mail to certain domains(hotmail.com, aol.com davidmorse.com and a few others. Previously their email was hosted at godaddy and every thing was fine.
Inhouse DNS is set up as a forwarder to ITC deltacom's DNS. We receive mail on one IP, but sent out thru another. Reverse DNS is set up on all of the IP's we use according to ITC and tests that I have done. We get delivery delayed messages 4.4.7 as well as undeliverable messages following that. A non-delivery report with a status code of 5.4.0 is reported in event viewer. An associate says that he believes that it is the fact that ITC (our provider) does not include spf records in their DNS and that is why we are not able to contact these certain domains! I'm stumped!!
Ask away....if more info is needed..ANY Help Appreciated!!!!!!!!!!!!!!.....Roy
P.S. I HAVE CHECKED OTHER POSTS...BUT NO LUCK...........