My Hotmail messages get stuck in the outbox, how can I stop it sending out multiple messages?

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AC Question

hotmail messages get stick in outbox

I have 3 email accounts on my Moto G - a gmail and a hotmail which are both fine, and a second hotmail which is the problem one. I write an email, no attachments, and it goes into the outbox. It then sits there for days until I delete it as it's periodically sending the email but leaving it in the outbox so my contacts are getting hundreds of my messages! I can receive messages fine, just can't send one and then stop! If I try to refresh the outbox it says connection failure but my other two email accounts are fine. Ive emptied my sent folder and I've factory reset my phone but no change. Pleeeease help! Thank you.