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Stop Gmail Grouping Your Site's Emails Into Threads

Adds a unique reference header to every email so Gmail shows each notification separately instead of bundling emails with the same subject into one long conversation.

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Code

add_action( 'phpmailer_init', function ( $phpmailer ) {
    $phpmailer->addCustomHeader( 'X-Entity-Ref-ID', wp_generate_uuid4() );
} );

Notes

Invisible to recipients; Gmail uses the X-Entity-Ref-ID header to decide whether to thread messages.

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