Ran into same problem on feisty herd-5. I am using msmtp instead of postfix, so I think it rules out that the issue is in postfix. The chmod u+s procmail change also fixed it for me.
** Changed in: procmail (Ubuntu)
Status: Unconfirmed => Confirmed
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had to chmod u+s procmail after edgy dist-upgrade
https://launchpad.net/bugs/68608
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