I am unable to send emails from AquaMail, with a "Too many login attempts" error message.
I can draft on AquaMail, those drafts will then appear in the mail drafts folder on other devices, and they can then be sent from those other devices, so I know that the problem is not my mail servers.
I have been travelling today, in the London Underground, on trains with tunnels, in rural areas with poor connections, so I can quite imagine that there have been lots of failed logins, but that shouldn't kill my ability to send for hours...