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Remove the X-Mailer Header From Emails

Stops outgoing emails announcing "PHPMailer" and its version in the X-Mailer header, which reveals details about your server and can count against you in spam filters.

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Code

add_action( 'phpmailer_init', function ( $phpmailer ) {
    $phpmailer->XMailer = ' ';
} );

Notes

PHPMailer omits the header entirely when it is set to a single space.

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