I need to block all emails from any .onmicrosoft.com account
I am getting inundated by junk / spam emails from numerous ".onmicrosoft.com" addresses. The existing junk filters in Thunderbird appear to be powerless to blocking all ".onmicrosoft.com" garbage. Creating a separate junk filter for every single permutation of this email address is simply too large of a task.
How about allowing a junk filter that would allow me to eliminate all ".onmicrosoft.com" addressed emails by using the convention of "*@*.onmicrosoft.com" . Where the "*" is read by thunderbird to mean anything occupying that address position.
Wšykne wótegrona (1)
That's a good idea, but for now you can create a Message Filter to do this.
Organize Your Messages by Using Filters
I have attached a screenshot showing what you want in this particular case.