docs: add Outlook to email config

Also there was a missing comma in Gmail example.

docs/tutorials/config.rst

@@ -2,14 +2,54 @@
 Configuring for Different Providers
 ===================================
 
+Sending emails from different email providers is easy.
+If you have your own SMTP server, you just need to 
+set the host address, port and possibly the credentials.
+There are also pre-configured sender instances for 
+common email providers:
+
+=================== =================== ================== ====
+Provider            Sender instance     Host               Port
+=================== =================== ================== ====
+Gmail (Google)      ``redmail.gmail``   smtp.gmail.com     587
+Outlook (Microsoft) ``redmail.outlook`` smtp.office365.com 587          
+=================== =================== ================== ====
+
+To use them, you may need to configure the account (see below)
+and then you can use the sender:
+
+.. code-block:: python
+
+    from redmail import outlook
+    outlook.user_name = 'example@hotmail.com'
+    outlook.password = '<YOUR PASSWORD>'
+
+    outlook.send(
+        subject="Example email",
+        receivers=['you@example.com'],
+        text="Hi, this is an email."
+    )
+
+.. note::
+
+    Often the email providers don't allow changing the sender address
+    to something else than what was used to log in. Therefore, changing 
+    the ``sender`` argument often has no effect.
+
 .. _config-gmail:
 
 Gmail
 -----
 
-You need to make an application password `see this Google's answer <https://support.google.com/accounts/answer/185833>`_.
-You may also need to set up `2-step verification <https://support.google.com/accounts/answer/185839>`_ in order to
-be able to create an application password. Don't worry, those are easy things to configure.
+In order to send emails using Gmail, you need to:
+
+- Set up `2-step verification <https://support.google.com/accounts/answer/185839>`_ (if not already)
+- Generate `an App password <https://support.google.com/accounts/answer/185833>`_:
+
+    - Go to your `Google account <https://myaccount.google.com/>`_
+    - Go to *Security*
+    - Go to *App passwords*
+    - Generate a new one (you may use custom app and give it a custom name)
 
 When you have your application password you can use Red Mail's gmail object that has the Gmail
 server pre-configured:
@@ -23,15 +63,28 @@ server pre-configured:
     # And then you can send emails
     gmail.send(
         subject="Example email",
-        receivers=['example@gmail.com']
+        receivers=['you@example.com'],
         text="Hi, this is an email."
     )
 
-.. note::
 
-    You can only send emails using your Gmail email address. Changing ``sender`` has no effect.
+.. _config-outlook:
 
-.. note::
+Outlook
+-------
+
+You may also send emails from MS Outlook. To do so, you just need to have a Microsoft
+account. There is a pre-configured sender which you may use:
+
+.. code-block:: python
+
+    from redmail import outlook
+    outlook.user_name = 'example@hotmail.com'
+    outlook.password = '<YOUR PASSWORD>'
 
-    ``gmail`` is actually nothing more than an instance of :class:`redmail.EmailSender`
-    with ``smtp.gmail.com`` as the host and ``587`` as the port.
+    # And then you can send emails
+    outlook.send(
+        subject="Example email",
+        receivers=['you@example.com'],
+        text="Hi, this is an email."
+    )