SMTP integration, send password hint by email.

.env

@@ -41,3 +41,10 @@
 # ROCKET_ADDRESS=0.0.0.0 # Enable this to test mobile app
 # ROCKET_PORT=8000
 # ROCKET_TLS={certs="/path/to/certs.pem",key="/path/to/key.pem"}
+
+## Mail specific settings, if SMTP_HOST is specified, SMTP_USERNAME and SMTP_PASSWORD are mandatory
+# SMTP_HOST=smtp.domain.tld
+# SMTP_PORT=587
+# SMTP_SSL=true
+# SMTP_USERNAME=username
+# SMTP_PASSWORD=password