You really don't need to have ip included in form (besides the reason of it could be changed), just have it in mail text, etc:
PHP Code:
mail('caffinated@example.com', 'My Subject', wordwrap("Line 1\nLine 2\nLine 3", 70));
to
PHP Code:
mail('caffinated@example.com', 'My Subject', wordwrap("Line 1\nLine 2\nLine 3\nIP: {$_SERVER['REMOTE_ADDR']}", 70));
(Note that {$_SERVER['REMOTE_ADDR']} only works in case of double quotes, for single ones use:)
PHP Code:
mail('caffinated@example.com', 'My Subject', wordwrap('Line 1\nLine 2\nLine 3\nIP: '.$_SERVER['REMOTE_ADDR'], 70));