What are the potential reasons for emails not being delivered when using a specific domain as the sender in PHP mail() headers?

There are several potential reasons for emails not being delivered when using a specific domain as the sender in PHP mail() headers. One common reason is that the domain's SPF (Sender Policy Framework) record may not be properly configured to allow the server sending the email. Another reason could be that the domain is on a blacklist, causing the email to be marked as spam. To solve this issue, you can ensure that the SPF record is correctly set up and that the domain is not blacklisted. 

// Set the sender's email address and domain
$from_email = 'sender@example.com';
$from_domain = 'example.com';

// Set additional mail headers
$headers = 'From: ' . $from_email . "\r\n";
$headers .= 'Reply-To: ' . $from_email . "\r\n";
$headers .= 'Return-Path: ' . $from_email . "\r\n";
$headers .= 'X-Mailer: PHP/' . phpversion();

// Set the additional parameter to send the mail from a specific domain
$additional_parameters = '-f' . $from_email;

// Send the email using mail() function
mail('recipient@example.com', 'Subject', 'Message', $headers, $additional_parameters);

Keywords

PHP mail() headers SPF DKIM

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