I require an interface to send bulk MMS/PXT to 23,049 clients on a regular basis. (Purly opt in, not spam).
I also need to be able to collect any responses, though this would be minimal.

How can I do this?.

Do the carriers offer an API for this?. I cant seem to find much information on their sites.

Failing that, Would it be feasible to send out the MMS using a series of 3G modems.
Given a good connection how long would this take?. I am assuming when I send MMS messages to more than one person using my phone its only doing the upload once and sending out notifications pointing to the one instance of the image or is there a part of the MMS spec that requires instances be deleted upon receiving?.

Would it be possible to go one step further and connect to the MMSC directly over wire instead of over the air?.

If sending MMS fails, Anybody know if the carriers allow WAP Push?.

I appreciate any time you may have spent on this question.
Thank you.