Mysql Not replacing whole string with a wildcard?

I am trying to remove junk after .com and .net in a huge list of emails I have so its just an email address with nothing after it. Example, an email is "abc@yahoo.com 19.45.16.20" I need to remove those numbers so I tried writing this query to replace anything after the m in .com to see if it would work,

mysql> update email set email = '%m ' where email not like '%.com' and email not

like '%.edu' and email not like '%.org' and email not like '%.gov';

The problem is, its replacing the whole email address with %m and not just getting rid of junk after the m in .com! Any ideas how I can just replace till the m in .com and the n in .net etc? Thank you!