Forum communautaire Thunderbird

I have seen this problem with roadrunner listed in the forum but my situation is a bit different. Neither my wife or I can send or receive roadrunner emails with different machines. She uses a Mac (sonoma 14.8.7), up to date, I use Linux Mint ver 22. We also have iPhones and iPads. none of these units send or receive emails for the last 24 hrs but all worked just fine before. Spectrum says it our problem not theirs. The tech person at Spectrum said they partner with Thunderbird but they did not know of any changes made.

I have changed passwords used different routers and anything I can think of to connect but the devices now all time out when trying to connect.

Help setting up first email account (protonmail.com) Keep getting: "unable to login at server, ether config, or credentials" error.

There used to be a way to block sending an e-mail to a particular recipient, how can I do this now? When using reply to, there is a defaut address that is used that causes an error. I need thunderbird to block this recipient ( only from sending as they are the default sender ). Thunderbird used to have this option for "sending rules" but it appears to have been removed.