Spam Filtering by Domain

Ok, so lately I’ve been getting a lot of spam email. The address always comes up like this:
name@randomcharachters.onmicrosoft.com. Blacklisting the domain doesn’t help as each email has a different set of random characters as part of the domain address. I was hoping to maybe get away with using a wildcard for that part of the domain, but it does not seem to work. Continually blacklisting domains is getting tiresome, not to mention how large that list is getting. Anyone with a similar problem that has figured out how to handle it? Thank you.

This may help
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Thank you! I’ll set that up and let you know how it works.

It works! Thank you so very much. Have a happy New Year!

Great!! And the same to you and yours.