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I need to block all emails from any .onmicrosoft.com account

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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.

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.

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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.