Added STARTTLS for SMTP

As many services don't support full encryption, there is now an
encryption option in the [smtp] section, allowing you to choose between
ssl_tls and starttls.

README.md

@@ -76,7 +76,7 @@ optional arguments:
 #### Emails/Password Resets
 * When someone initiates forget password on Jellyfin, a file named `passwordreset*.json` is created in its configuration directory. This directory is monitored and when created, the program reads the username, expiry time and PIN, puts it into a template and sends it to whatever address is specified in `emails.json`.
 * **The default forget password popup references the `passwordreset*.json` file created. This is confusing for users, so a quick fix is to edit the `MessageForgotPasswordFileCreated` string in Jellyfin's language folder.**
-* Currently, jellyfin-accounts supports generic SSL/TLS secured SMTP, and the [mailgun](https://mailgun.com) REST API. 
+* Currently, jellyfin-accounts supports generic SSL/TLS or STARTTLS secured SMTP, and the [mailgun](https://mailgun.com) REST API. 
 * Email html is created using [mjml](https://mjml.io), and [jinja](https://github.com/pallets/jinja) templating is used. If you wish to create your own, ensure you use the same jinja expressions (`{{ pin }}`, etc.) as used in `data/email.mjml` or `invite-email.mjml`, and also create plain text versions for legacy email clients.
 
 #### Configuration
@@ -177,11 +177,11 @@ api_url = https://api.mailgun.net...
 api_key = your api key
 
 [smtp]
-; Insecure SMTP hasn't been implemented, although I doubt many will need it.
-ssl = true
+; Choose between ssl_tls and starttls. Your provider should tell you which to use, but generally SSL/TLS is 465, STARTTLS 587
+encryption = starttls
 server = smtp.jellyf.in
 ; Uses SMTP_SSL, so make sure the port is for this, not starttls.
-port = 465
+port = 587
 password = smtp password
 
 [files]

data/config-default.ini

@@ -88,8 +88,8 @@ api_url = https://api.mailgun.net...
 api_key = your api key
 
 [smtp]
-; Insecure SMTP hasn't been implemented, although I doubt many will need it.
-ssl = true
+; Choose between ssl_tls and starttls. Your provider should tell you which to use, but generally SSL/TLS is 465, STARTTLS 587
+encryption = starttls
 server = smtp.jellyf.in
 ; Uses SMTP_SSL, so make sure the port is for this, not starttls.
 port = 465

jellyfin_accounts/email.py

@@ -139,7 +139,6 @@ class Smtp(Email):
         except ValueError:
             self.port = 465
             log.debug(f'{self.address}: Defaulting to port {self.port}')
-        self.context = ssl.create_default_context()
 
     def send(self):
         message = MIMEMultipart("alternative")
@@ -151,15 +150,29 @@ class Smtp(Email):
         message.attach(text)
         message.attach(html)
         try:
-            with smtplib.SMTP_SSL(self.server,
-                                  self.port,
-                                  context=self.context) as server:
-                server.login(self.from_address, self.password)
-                server.sendmail(self.from_address,
-                                self.address,
-                                message.as_string())
-            log.info(f'{self.address}: Sent via smtp')
-            return True
+            if config['smtp']['encryption'] == 'ssl_tls':
+                self.context = ssl.create_default_context()
+                with smtplib.SMTP_SSL(self.server,
+                                      self.port,
+                                      context=self.context) as server:
+                    server.ehlo()
+                    server.login(self.from_address, self.password)
+                    server.sendmail(self.from_address,
+                                    self.address,
+                                    message.as_string())
+                log.info(f'{self.address}: Sent via smtp (ssl/tls)')
+                return True
+            elif config['smtp']['encryption'] == 'starttls':
+                with smtplib.SMTP(self.server,
+                                  self.port) as server:
+                    server.ehlo()
+                    server.starttls()
+                    server.login(self.from_address, self.password)
+                    server.sendmail(self.from_address,
+                                    self.address,
+                                    message.as_string())
+                    log.info(f'{self.address}: Sent via smtp (starttls)')
+                    return True
         except Exception as e:
             err = f'{self.address}: Failed to send via smtp: '
             err += type(e).__name__