I've been testing out obfuscate=true a bit (which won't be a surprise to Eric, given a private email that was sent to both of us). One issue I noticed is that it breaks archive links. I've posted an example at <https://yhetil.org/obf/20201204120929.GA22736@dcvr/>:
Reported-by: Kyle Meyer <kyle@kyleam•com> Link: https://public-inbox.org/meta/87360nlc44.fsf@kyleam•com/
