I cannot send any emails out of my live.com account

I cannot send any emails out of my live.com account and get an error code that says "User name for SMPT (my account) @smpt.live.com is incorrect." I can use my account and password to sign into this community. I am using my iPhone and iPad and my computer to attempt sending the emails from. None work. This all started yesterday. I was able to change my password a couple times and know that it works as I am signed into this.