"\r\n" is a line break in windows. Since blank space is ignored by html, it won't add anything when viewing in html emails, but adds a blank line (or sometimes two on Linux servers) in the code.
If you sent a plain text email with no html content, you would have seen the breaks caused by "\r\n".
To have less space, remove one or all of the lines:
$MailBody = $MailBody . "<br>";
They each represent a line and you have four of them between each field. You could probably remove the two at the top and just leave the two at the bottom.
Did this help? Tips are appreciated...
