Welcome to the club on the PicMail subject
This has been all over the numerous forums about Sprint Picmail on Pda's
You cannot send PicMail....only via Email attachments
Example
10digitphonenumber@pm.sprint.com <----for sprint
Hacks for Sprint PicMail "Will Not Work" anymore....Sprint has "Blocked" this from taking place on PDA type phones starting approx 27Jan08.
http://forum.ppcgeeks.com/showthread.php?t=3&page=23