Description:
------------
When a string with the character sequence "\n.\n" is passed to the message argument of mail() function, the result email is truncated just before the sequence.

Reproduce code:
---------------
<?

$message = "Text before dot\n.\nText after dot";

mail($to, $subject, $message);

?>


Expected result:
----------------
An email like this:

--------------------------------------
Text before dot
.
Text after dot
--------------------------------------

Actual result:
--------------
An email like this:

--------------------------------------
Text before dot
--------------------------------------