SMTP support (#146)

README.md

@@ -33,7 +33,9 @@ wireguard interface stats. See the `cap_add` and `network_mode` options on the d
 
 Set the `SESSION_SECRET` environment variable to a random value.
 
-In order to sent the wireguard configuration to clients via email (using sendgrid api) set the following environment variables
+In order to sent the wireguard configuration to clients via email, set the following environment variables:
+
+- using SendGrid API
 
 ```
 SENDGRID_API_KEY: Your sendgrid api key
@@ -41,6 +43,18 @@ EMAIL_FROM_ADDRESS: the email address you registered on sendgrid
 EMAIL_FROM_NAME: the sender's email address
 ```
 
+- using SMTP
+
+```
+SMTP_HOSTNAME
+SMTP_PORT
+SMTP_USERNAME
+SMTP_PASSWORD
+SMTP_AUTH_TYPE
+EMAIL_FROM_ADDRESS: the sender's email address
+EMAIL_FROM_NAME: the sender's name
+```
+
 ### Using binary file
 
 Download the binary file from the release and run it with command: