What are the potential consequences of not correctly setting the sender in PHP emails?

If the sender is not correctly set in PHP emails, the email may be flagged as spam or not delivered at all. To ensure proper delivery and avoid being marked as spam, it is important to set the sender correctly using the "From" header in the email headers. 

$to = "recipient@example.com";
$subject = "Test Email";
$message = "This is a test email.";

$headers = "From: sender@example.com\r\n";
$headers .= "Reply-To: sender@example.com\r\n";

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

Keywords

email sender PHP mail function SPF record DKIM signature email deliverability

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