Email stuck in outbox

very simple to resolve issue with stuck email in outbox:

go to mail settings
click the outgoing message settings
check the box that says sign in and put your login details
also in security add accept all certificates
save settings and you are done.

you will not have any more problems with mails going to outbox
 
The solution is:
1. set the phone on the Flight mode (no e-mail connection)
2. enter the e-mail out box
3. now you can open, re-edit, re-size than re-send or delete unsent messages.
So you are done.