Setup SMTP Mail server on xampp (localhost))

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// C:\xampp\php\php.ini
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[mail function]
smtp_port=587
sendmail_from = your-gmail@gmail.com
sendmail_path = "\"C:\xampp\sendmail\sendmail.exe\" -t"

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// C:\xampp\sendmail\sendmail.ini
----------------------------------------------------------------------

smtp_server=smtp.gmail.com
smtp_port=587
error_logfile=error.log
debug_logfile=debug.log
auth_username=your-gmail@gmail.com
auth_password=your-gmail-password
force_sender=your-gmail@gmail.com

If it still not send mail then config your gmail account following instruction.
https://support.google.com/accounts/answer/6010255

DONE and restert Apache and enjoy