Problem with archives -- mail gets lost

This is a dead link, but should link to a post to pgsql-hackers sent a
little while ago:

http://www.postgresql.org/message-id/CAM3SWZScpWzQ-7EJC77vwqzZ1GO8GNmURQ1QqDQ3wRn7AbW1Cg@mail.gmail.com

I can even see my mail listed here, with a dead link to above:

http://www.postgresql.org/list/pgsql-hackers/since/201510120000/

The subject of the mail is "INSERT ... ON CONFLICT documentation
clean-up patch". What's up with this?

Thanks
-- 
Regards,
Peter Geoghegan