In Exim 3, $original_local_part didn't include any prefix/suffix. In
Exim 4, it does.
Sorry if this is a well-known fact.
I suppose this is either just a small glitch in the upgrade doc's list
of changes (or even that I just didn't find it) since it is changed in
spec.txt, which also tells me behavior change was intentional. If
there are ever updates (I'm looking at 4.52) to doc/Exim4.upgrade, I'd
suggest this change of behavior be mentioned. Caught me.
--
bill-exim@??? (WJCarpenter) PGP 0x91865119
38 95 1B 69 C9 C6 3D 25 73 46 32 04 69 D6 ED F3