add \r\n for line breaks:
//Start Mail Body
$MailBody = $MailBody . "Name: ";
$MailBody = $MailBody . ((isset($_POST["Name"]))?$_POST["Name"]:"");
$MailBody = $MailBody . "\r\n";
$MailBody = $MailBody . "Email: ";
$MailBody = $MailBody . ((isset($_POST["Email"]))?$_POST["Email"]:"");
$MailBody = $MailBody . "\r\n";
$MailBody = $MailBody . "Phone: ";
$MailBody = $MailBody . ((isset($_POST["Phone"]))?$_POST["Phone"]:"");
$MailBody = $MailBody . "\r\n";
$MailBody = $MailBody . "Message: ";
$MailBody = $MailBody . ((isset($_POST["Subject"]))?$_POST["Subject"]:"");
$MailBody = $MailBody . "\r\n";
//End Mail Body
or use <br> tags:
//Start Mail Body
$MailBody = $MailBody . "Name: ";
$MailBody = $MailBody . ((isset($_POST["Name"]))?$_POST["Name"]:"");
$MailBody = $MailBody . "<br>";
$MailBody = $MailBody . "Email: ";
$MailBody = $MailBody . ((isset($_POST["Email"]))?$_POST["Email"]:"");
$MailBody = $MailBody . "<br>";
$MailBody = $MailBody . "Phone: ";
$MailBody = $MailBody . ((isset($_POST["Phone"]))?$_POST["Phone"]:"");
$MailBody = $MailBody . "<br>";
$MailBody = $MailBody . "Message: ";
$MailBody = $MailBody . ((isset($_POST["Subject"]))?$_POST["Subject"]:"");
$MailBody = $MailBody . "<br>";
//End Mail Body