Nokia N8, MMS stuck in the outbox in Nokia N8

N8, Quires, Symbian^3, tutorial,

I've received some testimonials from people with problems sending MMS via Nokia N8. Apparently even with the outgoing message, These MMS remains stuck in the outbox. The worst is that this does not allow to be deleted from there. If there is anyone experiencing this problem, follow these steps to fix this problem.

In Messaging, go into Options > Settings > Multimedia message
In MMS Creation