On 14 Mar 2017 08:56 +1100, from dave at horsfall.org (Dave Horsfall):
>> I can live with multipart/alternative { text/plain, text/html } messages 
>> where the plain text part is actually _meaningful_ (my MUA is set up to 
>> do nothing with text/html unless I ask it, at which point they are fed 
>> through 'lynx -dump' plus a few other parameters), but have been known 
>> to shoot back HTML-_only_ messages to the originator. Usually with a 
>> comment to the effect of "this looks like it came through garbled". I'm 
>> still waiting for the first such recipient to obviously take the hint, 
>> but I haven't yet given up hope.
> 
> Procmail?  I'd like to have that script :-)

Sorry, no automation, but it'd probably be possible to cobble
something together using procmail and formail. Just "unauto_view *"
and "alternative_order text/plain text/html text" plus hitting "reply"
in Mutt and coming up with something bearing a not too close
resemblance to insults. The exact wording tends to vary with how
annoyed I am at the particular sender at the moment.

-- 
Michael Kjörling • https://michael.kjorling.se • michael at kjorling.se
                 “People who think they know everything really annoy
                 those of us who know we don’t.” (Bjarne Stroustrup)