Ok,
No joy
, same as you I can receive but can't send. Says sent successfully but never gets to the recipient nor does it show up in the sent folder on the sprint picmail website.
As a side note, this is behaving the same as mine was. I think you went into the mms settings and changed the same stuff i did. Also when you receive one, after you close the viewer the phone sticks in landscape until i hit the back button and then drop the task manager down and raise it. After that cycle it jumps back to portrait... wierd
Anyway, how bout my other question as to removing the htc messaging client and just letting WinMo handle texting and picmail via either sprint picmail or ArcSoft. I would be content if I could still see the single texts at a time in sense much like older manila and then launch WinMo client when I tap on the text in sense, but I don't know what packages to remove to allow for that.