[cmylxgo]

I've finally got around to doing some more testing. One of my suspicions was that the sprint/ATT/Verizon ect...mail servers were blocking the messages with their SPAM filters. Doing a lookup of the recipient host and if they do not match then block msg. This is an inbound filter. But this is not the case.

I configured my PC to send a message to #@pm.sprint.com with the Reply-to address as my #@pm.sprint.com and I was able to successfully send MMS. I also tried setting my Reply-to address as my #@messaging.sprintpcs.com and was able to send and receive txt msgs.

So in a nutshell...

You cannot send an email from your phone to any account with the Reply-to address with any part of sprint in the address or it will be blocked/dropped/rejected before it leaves the Sprint network.

My next test...when I get some more free time...is to try and configure SendMail, and SMTP server, to replace my reply-to address with my sprint pm address once it leaves the sprint network. This should resolve the issue...but its a lot of work and will only work for users I can configure. I think I might just live with MMS responses coming to my Exchange E-Mail account.