To send mail from localhost XAMPP using Gmail, configure XAMPP after installing it. Follow the below steps for the same.
Steps to Send Mail From Localhost XAMPP Using Gmail:
Open XAMPP Installation Directory.
Go to C:\xampp\php and open the php.ini file.
Find [mail function] by pressing ctrl + f.
Search and pass the following values:

smtp=smtp.gmail.com
smtp_port=587
sendmail_from = [email protected]
sendmail_path = "\"C:\xampp\sendmail\sendmail.exe\" -t"

Now, go to C:\xampp\sendmail and open the sendmail.ini file.
Find [sendmail] by pressing Ctrl + F.
Search and pass the following values

smtp_server=smtp.gmail.com
smtp_port=587 or 25 //use any of them
error_logfile=error.log
debug_logfile=debug.log
[email protected]
auth_password=your-gmail-password
[email protected](optional)

Here is the actual code that you have to write
Script To Send Mail:

<?php
$to_email = "[email protected]";
$subject = "Simple Email Test via PHP";
$body = "Hi, This is test email send by PHP Script";
$headers = "From: sender email";
  if (mail($to_email, $subject, $body, $headers))
   {
     echo "Email successfully sent to $to_email...";
   }
       else {
     echo "Email sending failed...";
     }
?>

Note: If you are getting a warning message then Please configure “Less secure apps” settings as shown below. Sometimes without turning on the ‘less secure apps’ is the main reason the user didn’t receive the mail.
Turning on ‘less secure apps’ settings as mailbox user.

  • Go to your (Google Account).
  • On the left navigation panel, Click Security.
  • On the bottom of the page, in the Less secure app access panel, click Turn on access.

    If you don’t see this setting, your administrator might have turned off less secure app account access (check the instruction above).
    Click the Save button.
    Now your email will be sent successfully. Have a good day and please share your story in the comment box.