Need Code to Alter Comments

I know that this code lets me alter the way my comment looks as opposed to others:

<?php
$isByAuthor = false;
if($comment->comment_author_email == ‘[email protected]’) {
$isByAuthor = true;
}
?>

What I’m wondering is…

How can I alter that code to apply to everyone EXCEPT a certain e-mail?

I assume it would mean altering this part of the code:

if($comment->comment_author_email == ‘[email protected]’)

Anyone know how to accomplish this?

Thanks.