My company just purchased an email list that has numberous duplicate emails.
It looks something like this:

First Name Last Name Email
Thomas Gordon 1buzz@airmail.net
William Hughes 1buzz@airmail.net
Robert Doby 1buzz@airmail.net
Carter Burdette 1buzz@airmail.net
Claudia Coscia 1buzz@airmail.net
Christine Holland 1buzz@airmail.net
Joel Hayhurst 1jpatterson@airmail.net
Krista Bates 1jpatterson@airmail.net
William Hayward 1jpatterson@airmail.net
D Wade Cloud 1jpatterson@airmail.net
John Sonderegger 1js@calweb.com

We would like to remove all duplicate emails except for the first occuring
one so that it would look like this:

First Name Last Name Email
Thomas Gordon 1buzz@airmail.net
William Hughes
Robert Doby
Carter Burdette
Claudia Coscia
Christine Holland
Joel Hayhurst 1jpatterson@airmail.net
Krista Bates
William Hayward
D Wade Cloud
John Sonderegger 1js@calweb.com


Is there some way to set up a filter to do this automatically? Thanks for
your help in advance!!