make SMTP server configurable

.env-sample

@@ -22,6 +22,8 @@ REPORT_STATS=yes
 
 IDENTITY_SERVER_URL=https://vector.im
 
+SMTP_HOST=mailhog
+SMTP_PORT=1025
 MAIL_NOTIF_FROM_ADDRESS=noreply@$DOMAIN
 ABUSE_SUPPORT_EMAIL=abuse@$DOMAIN
 SECURITY_SUPPORT_EMAIL=security@$DOMAIN

data-template/mas/config.yaml

@@ -44,8 +44,8 @@ email:
   reply_to: '${MAS_EMAIL_REPLY_TO}'
   transport: smtp
   mode: plain
-  hostname: mailhog
-  port: 1025
+  hostname: ${SMTP_HOST}
+  port: ${SMTP_PORT}
 ${SECRETS_MAS_SECRETS}
 passwords:
   enabled: true

data-template/synapse/homeserver.yaml

@@ -70,8 +70,8 @@ background_updates:
     sleep_enabled: false
 
 email:
-  smtp_host: mailhog
-  smtp_port: 1025
+  smtp_host: ${SMTP_HOST}
+  smtp_port: ${SMTP_PORT}
   enable_tls: false
   notif_from: "Your %(app)s homeserver <${MAIL_NOTIF_FROM_ADDRESS}>"
   app_name: Matrix