It is possible. Normally, php mail function sends it's content in plain text form. To send it as HTML, which will enable html markup, use this:
// To send HTML mail, the Content-type header must be set
$headers .= "\r\n" . 'Content-type: text/html; charset=iso-8859-1';
// I have changed the above to add new lines before the string, so you can add it before the mail function
this is an extract from http://php.net/manual/en/function.mail.php
Of course, you should also change the charset to preferred one, like utf-8.
You can either change this:
$headers = 'From: '.$user_Email.'' . "\r\n" .
'Reply-To: '.$user_Email.'' . "\r\n" .
'X-Mailer: PHP/' . phpversion();
...to:
$headers = 'From: '.$user_Email.'' . "\r\n" .
'Reply-To: '.$user_Email.'' . "\r\n" .
'X-Mailer: PHP/' . phpversion() . "\r\n" .
'Content-type: text/html; charset=utf-8'
Regarding your question in comments:
See this: @$sentMail = mail($to_Email, $subject, $user_Message .' -'.$user_Name, $headers);
The third parameter is the message you send. Since we added a header informing that a HTML document will be sent, we can use HTML tags.
To do so, edit $user_message
to contain HTML document. For example, to simply make all the text bold, make
$user_message = '<html><head></head><body><b>' . $user_message . '</b></body></html>'
. When you add the Content-type: text/html
header, the $user_message
behaves exactly like a webpage, you can use almost all html tags.