Mikrotik Hotspot

 http://cotswoldpc.blogspot.com/p/mikrotik-routerboard-rb750up-simple.html

https://datoweb.com/post/433-validar-correo-electrnico-con-javascript 

https://blog.reaccionestudio.com/validar-email-con-javascript-y-html-5/

https://stackoverflow.com/questions/8389646/send-post-data-on-redirect-with-javascript-jquery