The fact that this problem has been ongoing for TWO+ YEARS with no clearly defined fix makes me want to take my SP3 back to the store and go buy an iPad, even though I hate Apple products. I think I'm voicing the frustrations of the people here when I say that I've been searching for over an hour with no possible fix in sight, and an apparently apathetic Microsoft.
Dear Microsoft,
Your Mail App STILL has this issue: it randomly decides that it won't send any mail and so every outgoing e-mail sits in the Outbox of the app. This seems to be some kind of password-crossing issue where multiple passwords from multiple accounts get switched. However, I've been searching for over an hour and CANNOT find a fix to this problem despite the many unanswered/unresolved forums and questions regarding this 2+ yr old problem.
By the way, thank you so much for removing the ability to go into Settings > Account within the Mail App and change the password. Now I have no idea how to fix your issue even manually. Please put the setting back so I can fix it, or just release a version of the Mail App which WORKS.
Thanks a bunch,
Twixte
In the meantime, has anyone else figured out how to temporarily resolve this annoying issue? Is there a setting I can change or do I just need to completely disconnect my Microsoft account from my SP3 before I can actually send mail again?