So the solution was to upgrade procmail to the latest
version, procmail-3.11pre4 . The canonical site is
ftp://ftp.informatik.rwth-aachen.de/pub/packages/procmail/procmail.tar.gz
Well, that worked for you. Unfortunately, even with the 3.11pre4, this
problem is making me mad.
I'm about to drop procmail because of it. I asked about it some time ago
and also got no response.
It seems the problem occurs when the recipient envelope is composed of
many addresses. I've been thinking about rewriting the recipient envelope
to strip everyone but me, but this is not a full solution (in fact, I
don't even know if it works), because important information woul be lost.
Do you know is the development team is steering at this?
Regards, Roberto