How can PHP developers ensure that their email headers are RFC compliant to avoid problems with email delivery and content display?

To ensure that email headers are RFC compliant, PHP developers can utilize the `mb_encode_mimeheader()` function to properly encode header values containing non-ASCII characters. This function will ensure that the headers are correctly formatted according to RFC standards, preventing issues with email delivery and content display. 

$subject = 'Subject with non-ASCII characters 你好';
$subject = mb_encode_mimeheader($subject, 'UTF-8', 'B');

$headers = "From: sender@example.com\r\n";
$headers .= "Content-Type: text/plain; charset=UTF-8\r\n";
$headers .= "Subject: $subject\r\n";

// Additional headers and message content setup

Keywords

PHP email headers RFC compliant email delivery content display

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