Fix mypy

README.md

@@ -58,6 +58,22 @@ message = EmailMessage(
     bcc=['bcc@example.com'],
     text_body='Hello world!',
     html_body='<b>Hello world!</b>',
+)
+```
+
+`cc`, `bcc`, `to`, `reply_to` can be either strings or lists of strings.
+
+## Attachments
+
+Use `attach_file` and `attach_content` to add attachments. Also, you can use `Attachment` class for more control.
+
+```python
+from mailers import EmailMessage, Attachment
+
+message = EmailMessage(
+    to='user@localhost',
+    from_address='from@example.tld',
+    text_body='Hello world!',
     attachments=[
         Attachment('CONTENTS', 'file.txt', 'text/plain'),
     ]
@@ -66,11 +82,30 @@ message = EmailMessage(
 # attachments can be added on demand:
 await message.attach_file(path='file.txt')
 
+# attach using a class
+message.add_attachment(Attachment('CONTENTS', 'file.txt', 'text/plain'))
+
 # or you may pass attachment contents directory
 message.attach_content(file_name='file.txt', content='HERE GO ATTACHMENT CONTENTS', mime_type='text/plain')
 ```
 
-`cc`, `bcc`, `to`, `reply_to` can be either strings or lists of strings.
+## Inline attachments
+
+You can add inline attachments (eg. images) and then reference them in HTML. For that, set `inline=True` and
+specify `content_id=SOMEUNIQID` arguments in `attach_*` functions. Then you can reference images in HTML part like
+that `<img src="cid:SOMEUNIQID">"`.
+
+```python
+from mailers import EmailMessage, Attachment
+
+message = EmailMessage(
+    to='user@localhost',
+    from_address='from@example.tld',
+    html_body='Render me <img src="cid:img1">',
+)
+
+await message.attach_file(path='/path/to/image.png', inline=True, content_id='img1')
+```
 
 ## DKIM signing
 

mailers/transports.py

@@ -5,11 +5,10 @@
 import aiosmtplib
 import datetime
 import os
-import ssl
 import sys
 import typing as t
 from email.message import Message
-from typing import Any, List, Optional, Union
+from typing import Any, List, Union
 
 from .config import EmailURL
 
@@ -109,24 +108,23 @@ def __init__(
         self,
         host: str = "localhost",
         port: int = 25,
-        user: Optional[str] = None,
-        password: Optional[str] = None,
-        use_tls: Optional[bool] = None,
+        user: str = None,
+        password: str = None,
+        use_tls: bool = None,
         timeout: int = 10,
-        key_file: Optional[str] = None,
-        cert_file: Optional[str] = None,
+        key_file: str = None,
+        cert_file: str = None,
     ):
         self._host = host
         self._user = user
         self._port = port
         self._password = password
-        self._use_tls = use_tls
+        self._use_tls = use_tls or False
         self._timeout = timeout
         self._key_file = key_file
         self._cert_file = cert_file
 
     async def send(self, message: Message) -> None:
-        context = ssl.create_default_context()
         await aiosmtplib.send(
             message,
             hostname=self._host,
@@ -135,7 +133,6 @@ async def send(self, message: Message) -> None:
             username=self._user,
             password=self._password,
             timeout=self._timeout,
-            tls_context=context,
             client_key=self._key_file,
             client_cert=self._cert_file,
         )