SMimeEncrypter add Tip

Author: zairigimad

mailer.rst

@@ -656,6 +656,11 @@ and it will select the appropriate certificate depending on the ``To`` option::
     $firstEncryptedEmail = $encrypter->encrypt($firstEmail);
     $secondEncryptedEmail = $encrypter->encrypt($secondEmail);
 
+.. tip::
+
+    The ``SMimeEncrypter`` class defines a second argument to choose
+    an algorithm to encrypt the message. the cipher must be one of these PHP constants: https://www.php.net/manual/en/openssl.ciphers.php
+    
 Sending Messages Async
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