Michael, thank you so much for the time you've put into this. As it
turns out, I seem to have stumbled on the solution by pure luck because
it has suddenly started working. For posterity, I can't say for sure
what fixed it but two possibilities spring to mind:
a) My Pine mailer warned me to chmod 1777 my /var/spool/mail directory
so I did, maybe that fixed it - although none of my mail goes there.
Perhaps procmail needs it as some kind of temp directory. Or...
b) Human error - something I was doing wrong previously because I was
very tired, having driven myself crazy with this problem. Taking a break
always helps.
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