Compare email lists

I was asked to write this script by a friend who needs to find out which users have subscribed to two email lists.

It works 98%. The first 1% is that the program needs one email per line. The other 1% is that you need to put a newline or carriage return after the last address in the left list.

I will get round to sorting it.
                              ...one day ;-)

Note

Please enter one address per line. I haven't yet gotten aound to csv (comma seperated) lists. Sorry...