mailman3 posts have wrong Archived-At header

A recent tor-relays@ mail comes with the headers

Archived-At:                                                                    
        <https://torproject.org/mailman3/hyperkitty/list/tor-relays@lists.torproject.org/message/TAZHRVZRGN2OTDPP6R7ZUY5KX6QCMGZY/>                            
List-Archive:                                                                   
        <https://torproject.org/mailman3/hyperkitty/list/tor-relays@lists.torproject.org/>                                                                     

both of which are broken urls.