Are there specific settings or configurations within PHP that need to be adjusted to ensure successful delivery of emails to T-Online domains?

To ensure successful delivery of emails to T-Online domains, it is recommended to properly configure the email headers and settings in PHP. This includes setting the "From" header to a valid email address, ensuring proper DKIM and SPF records are in place, and using a dedicated IP address for sending emails to improve deliverability. 

// Example PHP code snippet to set proper email headers for sending emails to T-Online domains
$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";
$headers .= "MIME-Version: 1.0\r\n";
$headers .= "Content-Type: text/html; charset=ISO-8859-1\r\n";

// Send email
mail($to, $subject, $message, $headers);

Keywords

PHP email delivery T-Online domains configuration settings SMTP protocol

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