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.