Just use googlemail,its so simple to use,has never failed me in two years,you can send as many pictures as you like and it's free.
Gave up on outlook express as it was constantly having issues,I'm amazed people still bother with it,also got googlemail on my phone,even my 70 year old mother can use that!!!
You won't look back mate,takes 10 mins to set an account up,pictures arrive instantly as well,the mrs emailed some pics the other night while I was talking to her on the phone and they were there 30seconds later.