How can I perform a SQL 'NOT IN' query faster?

Question

I have a table (EMAIL) of email addresses:

EmailAddress
------------
jack@aol.com
jill@aol.com
tom@aol.com
bill@aol.lcom

and a table (BLACK

Answer 1

select E.EmailAddress
  from EMAIL E where not exists
         (select EmailAddress from BLACKLIST B where B.EmailAddress = E.EmailAddress)

Equals (BTW there is probably an owner)

select EmailAddress from mail.EMAIL 
EXCEPT
select EmailAddress from mail.BLACKLIST 

will give you the rows that are different even if NULL in an EmailAddress