How can one address the issue of activation emails sent via PHP ending up in the recipient's spam folder?

Issue: Activation emails sent via PHP ending up in the recipient's spam folder can be addressed by ensuring that the email headers are properly set, the email content is not flagged as spammy, and the sending server's reputation is good. 

// Set the email headers to prevent emails from being marked as spam
$headers = "From: Your Name <your_email@example.com>\r\n";
$headers .= "Reply-To: Your Name <your_email@example.com>\r\n";
$headers .= "MIME-Version: 1.0\r\n";
$headers .= "Content-Type: text/html; charset=ISO-8859-1\r\n";

// Send the activation email
$to = "recipient@example.com";
$subject = "Activate your account";
$message = "Please click the link below to activate your account: <a href='http://www.example.com/activate.php?token=123456'>Activate</a>";
$mail_sent = mail($to, $subject, $message, $headers);

if($mail_sent) {
    echo "Activation email sent successfully.";
} else {
    echo "Failed to send activation email.";
}

Keywords

PHP email spam folder deliverability SMTP

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