send email only one time from the ip address php code example

Example 1: core php mail function without phpmailer

<?php
ini_set('display_errors',1);
ini_set('display_startup_errors',1);
error_reporting(-1);

session_start();

$to = '[email protected]';
$subject = 'Subject xxxxx xxxxxx';

$headers = "MIME-Version: 1.0\r\n";
$headers .= "Content-Type: text/html; charset=charset=utf-8\r\n";
$headers .= "From: " . $_POST['email'] . "\r\n";
//$headers .= "Reply-To: ". $_POST['email'] . "\r\n";
$headers .= "CC: [email protected]\r\n";



$message = "<html><body>";

$message .= '<table style="border-color: #666; background: #eee; cellpadding="10">';
$message .= "<tr><td><strong>Name:</strong> </td><td>" . $_POST['username'] . "</td></tr>";
$message .= "<tr><td><strong>Email:</strong> </td><td>" . $_POST['email'] . "</td></tr>"; 


$message .= "</table>";
$message .= "</body></html>";


echo $message;
//echo $headers;



$response=mail($to, $subject, $message, $headers);

if($response==1)
{
echo "<script language='javascript' type='text/javascript'>
        
       window.location = 'index.html';
    </script>";

}
else{
echo 
"<script language='javascript' type='text/javascript'>
        alert('mail send failed');
    </script>";
}



?>

Example 2: php mail function

<?php
	//Sending mail from contact form page.
  	// It works perfectly for me. 
  	//Edit it and make it your own.
  	
  	
    $to = "[email protected]";
    $from = $_POST['email'];
    $name = $_POST['name'];
    $subject = $_POST['subject'];
    $number = $_POST['number'];
    $cmessage = $_POST['message'];

    $headers = "From: $from";
	$headers = "From: " . $from . "\r\n";
	$headers .= "Reply-To: ". $from . "\r\n";
	$headers .= "MIME-Version: 1.0\r\n";
	$headers .= "Content-Type: text/html; charset=ISO-8859-1\r\n";

    $subject = "You have a message from your Bitmap Photography.";

    $logo = 'img/logo.png';
    $link = '#';

	$body = "<!DOCTYPE html><html lang='en'><head><meta charset='UTF-8'><title>Express Mail</title></head><body>";
	$body .= "<table style='width: 100%;'>";
	$body .= "<thead style='text-align: center;'><tr><td style='border:none;' colspan='2'>";
	$body .= "<a href='{$link}'><img src='{$logo}' alt=''></a><br><br>";
	$body .= "</td></tr></thead><tbody><tr>";
	$body .= "<td style='border:none;'><strong>Name:</strong> {$name}</td>";
	$body .= "<td style='border:none;'><strong>Email:</strong> {$from}</td>";
	$body .= "</tr>";
	$body .= "<tr><td style='border:none;'><strong>Subject:</strong> {$csubject}</td></tr>";
	$body .= "<tr><td></td></tr>";
	$body .= "<tr><td colspan='2' style='border:none;'>{$cmessage}</td></tr>";
	$body .= "</tbody></table>";
	$body .= "</body></html>";

    $send = mail($to, $subject, $body, $headers);

?>

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Php Example