On Thu, Apr 13, 2023 at 01:59:56PM +0200, Sébastien Hinderer wrote: > I am unfortunate enough to have to use an Office365 e-mail account.
> I don't know how to proceed from here. I really would like PLAIN to work > because the only other mechanism supported is XAUTH2, which feels like a > hell. The server is lying to you that it supports AUTH=PLAIN. Microsoft has disabled basic authentication across most of their services and you must use XOAUTH2. See e.g.: https://www.bleepingcomputer.com/news/microsoft/microsoft-will-turn-off-exchange-online-basic-auth-in-january/ imc
