How to block an email domain

[fogey0]

I am being inundated with junk email from a domain where the sender (s) simply change a letter or number on their user name and they get through. I need to block the domain eg: @xxx.yyy.edu.

 

[LannyC]

Consider funneling all your incoming email through a Gmail account. Gmail’s spam filter is extremely effective, and it’s easy to whitelist exceptions.

 

[Aerofly]

My email provider allows me to mark an email as spam and gives me the option to block the sender and the domain.
Try marking the mail as spam and perhaps your provider will give the option to do the same.