Thank you very much, Sir. Please can I have the source file without SMTP, then I can use the free hosting server for practice because I couldn't make SMTP on my computer?
The link is broken, but there's a way around it by right clicking and open link in new window. If it doesn't auto open to save, copy the address and paste in new window, here's the actual address to copy paste demo.webslesson.info/source-code/otp-php-registration.rar