How can one ensure that emails sent via PHP do not get marked as spam or filtered out by blacklists?

To ensure that emails sent via PHP do not get marked as spam or filtered out by blacklists, it is important to properly set up the email headers, use a valid "From" address, authenticate the email server, and avoid sending bulk emails from shared hosting servers. 

// Set up email headers
$headers = "MIME-Version: 1.0" . "\r\n";
$headers .= "Content-type:text/html;charset=UTF-8" . "\r\n";

// Set a valid "From" address
$from = "From: yourname@example.com";

// Authenticate the email server
ini_set("SMTP", "mail.example.com");
ini_set("smtp_port", "25");
ini_set("sendmail_from", "yourname@example.com");

// Send email
$to = "recipient@example.com";
$subject = "Test Email";
$message = "This is a test email.";
mail($to, $subject, $message, $headers, $from);

Keywords

SPF DKIM DMARC email headers deliverability

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