How can PHP developers ensure that emails sent from contact forms are not classified as spam by mail servers, and what steps can be taken to monitor and address delivery issues?

To ensure emails sent from contact forms are not classified as spam by mail servers, PHP developers can set up proper email authentication, such as SPF, DKIM, and DMARC records. Additionally, they can monitor email delivery using tools like Mailgun or SendGrid to track email open rates, bounce rates, and spam reports. 

// Example of setting up SPF, DKIM, and DMARC records in PHP
// SPF record
$headers = "MIME-Version: 1.0\r\n";
$headers .= "Content-type: text/html; charset=iso-8859-1\r\n";
$headers .= "From: Your Name <youremail@yourdomain.com>\r\n";
$headers .= "Reply-To: replyto@yourdomain.com\r\n";
$headers .= "Return-Path: returnpath@yourdomain.com\r\n";
$headers .= "X-Mailer: PHP/".phpversion()."\r\n";
$headers .= "X-Originating-IP: ".$_SERVER['SERVER_ADDR']."\r\n";
$headers .= "Received: from ".$_SERVER['SERVER_NAME']." (".$_SERVER['SERVER_ADDR'].")\r\n";

// DKIM record
$private_key = "your_private_key";
$domain = "yourdomain.com";
$selector = "default";
$dkim_headers = "From: yourname@yourdomain.com";
$message = "Your message content";
$signed_message = dkim_sign($dkim_headers, $message, $private_key, $selector, $domain);

// DMARC record
$headers .= "Authentication-Results: dmarc=fail (p=reject) header.from=yourdomain.com\r\n";

// Send email
mail("recipient@example.com", "Subject", $signed_message, $headers);

Keywords

PHP email delivery spam classification monitoring troubleshooting

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