2) No you wouldnt want it to leave it there. I dont have many ideas on this as its not my area of expertise. Sorry

3) Not sure if you are UK or USA so i'll put both....

UK
APN: general.t-mobile.uk
MMSC: http://mmsc.t-mobile.co.uk:8002
User Name: user
Password: pass
HTTP Proxy: 149.254.201.135
Port Number: 8080

USA
APN: wap.voicestream.com
MMSC: http://216.155.174.84/servlets/mms (or http://208.67.216.231/servlets/mms)
User Name: (leave blank)
Password: (leave blank)
HTTP Proxy: 216.155.165.50
Port Number: 8080 (or 9201 if 8080 fails)

Put resize images on Medium, and then network mode on Rude.

If thats still not working, ring up t-mobile and ask them if mms is enabled on your account.

If thats still not working - on the off chance are you running PR1.2 and did you do the update yourself? Have you formatted since updating to PR1.2 at any point?