Compare two email lists and output non-matching

Hi,

I am a newbie and need your expert help please.

I have two email lists. For example they are:

List 1:

a@spam.com
b@spam.com
c@spam.com

List 2:

abcdef@spam.com
b@spam.com
c@spam.com

In list 1 the non-matching address is a@spam.com. namely it is not common to both lists. I want to automatically go through the lists and output firstly a new list of the non-matches from column 1 and also a new list of the non-common items from list two.

So in this case the result would be that somewhere there is a new list from list 1 that has "a@spam.com" and secondly there is a new list from list 2 that has "abcdef@spam.com."

Obvioulsy the real list is more complicated and longer but the principle will be the same.

Can anyone help please?