When someone uses SweetCaptcha Contact Form, the message is sent with single spaces between each words and no new line.
So I edit sweetcaptcha-contact-form.php at line 245:
before:
$_REQUEST['swtcptcf_contact_message']
after:
str_replace( " ", " ", str_replace( "\n", "<br />", $_REQUEST['swtcptcf_contact_message'] ) )
Now sent messages are easier to read, especially about the new line character, people usually input it, like in this forum.
http://wordpress.org/extend/plugins/sweetcaptcha-revolutionary-free-captcha-service/