Optimized mail integration and solved bugs (hopefully I didn't create more)

roles/docker-pixelfed/templates/env.j2

@@ -48,11 +48,13 @@ RESTRICTED_INSTANCE=false
 MAIL_DRIVER=log
 MAIL_HOST={{system_email_host}}
 MAIL_PORT={{system_email_smtp_port}}
-MAIL_FROM_ADDRESS="{{system_email_address}}"
+MAIL_FROM_ADDRESS="{{system_email_from}}"
 MAIL_FROM_NAME="Pixelfed"
-MAIL_USERNAME={{system_email_address}}
+MAIL_USERNAME={{system_email_username}}
 MAIL_PASSWORD={{system_email_password}}
-MAIL_ENCRYPTION=tls
+# Not sure if the following is correct
+# Checkout: https://github.com/pixelfed/pixelfed/blob/dev/.env.docker
+MAIL_ENCRYPTION={{ 'ssl' if system_email_start_tls else 'tls' }} 
 
 ## Databases (MySQL)
 DB_CONNECTION=mysql