Send via SMTP support for aliases

CONTRIBUTING.md

@@ -174,4 +174,11 @@ python email_handler.py
 swaks --to e1@sl.local --from hey@google.com --server 127.0.0.1:20381
 ```
 
+4) Send a test email via SMTP 
+   * Make sure SMTP is enabled in settings and password is generated for the alias
+
+```bash
+swaks --to hey@google.com --from e1@sl.local --server 127.0.0.1:465 --tls-on-connect --auth --auth-user e1@sl.local
+```
+
 Now open http://localhost:1080/ (or http://localhost:1080/ for MailHog), you should see the forwarded email.

README.md

@@ -489,6 +489,40 @@ docker run -d \
     simplelogin/app:3.4.0 python job_runner.py
 ```
 
+#### Enable Sending via SMTP
+
+For sending via SMTP  you need to make sure you have the required SSL certificate and key at following, as SMTP requires SSL.
+
+- `$(pwd)/smtp_ssl_cert.pem` for SSL Certificate file,
+- `$(pwd)/smtp_ssl_privkey.key` for Key file.
+- adjust this according to where you have the files present.
+
+You can use the following command to generate a self-signed certificate for testing.
+
+```bash
+openssl req -x509 -newkey rsa:4096 -keyout smtp_ssl_privkey.key \
+  -out smtp_ssl_cert.pem -sha256 -days 3650 -nodes \
+  -subj "/C=US/ST=Oregon/L=Portland/O=My Company/OU=Org/CN=mydomain.com"
+```
+
+then run `SMTP handler`
+
+```bash
+docker run -d \
+    --name sl-smtp \
+    -v $(pwd)/sl:/sl \
+    -v $(pwd)/sl/upload:/code/static/upload \
+    -v $(pwd)/simplelogin.env:/code/.env \
+    -v $(pwd)/dkim.key:/dkim.key \
+    -v $(pwd)/dkim.pub.key:/dkim.pub.key \
+    -v $(pwd)/smtp_ssl_cert.pem:/smtp_ssl_cert.pem
+    -v $(pwd)/smtp_ssl_privkey.key:/smtp_ssl_privkey.key
+    -p 465:465 \
+    --restart always \
+    --network="sl-network" \
+    simplelogin/app:3.4.0 python SMTP_handler.py
+```
+
 ### Nginx
 
 Install Nginx and make sure to replace `mydomain.com` by your domain