Unfortunately, lists.linuxfoundation.org is no longer hosting any mailing list archives, not just for bitcoin-dev but all the other mailing lists too.
I’m opening this to discuss how to best approach the fix.
kanzure suggested in #29782 (comment):
Wait and see if they put it back up.
Update those locations in the source code to the proposed new urls like https://gnusha.org/pi/bitcoindev/c3f68b73-84c6-7428-4bf6-b47802141392@mattcorallo.com/ with the Message-ID in the url.
Use https://gnusha.org/url/https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2019-February/016697.html style urls to help others fight web/bit rot for similar links on the web.
The current PR takes approach 2, update old lists.linuxfoundation.org
links with gnusha.org
ones. I’ll implement approach 3 if that’s the consensus of the community.