Updated default mail options

.env.example

@@ -17,9 +17,13 @@ DB_USERNAME=database_username
 DB_PASSWORD=database_user_password
 
 # Mail system to use
-# Can be 'smtp', 'mail' or 'sendmail'
+# Can be 'smtp' or 'sendmail'
 MAIL_DRIVER=smtp
 
+# Mail sender options
+MAIL_FROM_NAME=BookStack
+MAIL_FROM=bookstack@example.com
+
 # SMTP mail options
 MAIL_HOST=localhost
 MAIL_PORT=1025