hmm,
there was a bug in vdelivermail.
user and domain part of the email address should being lowercased before
processing.
it is fixed in 4.9.5/Oct 23. or 24.
or look in vdelivermail.c
in function main() near line 850
-----snip------
lowerit(TheUser);
lowerit(TheDomain);
scopy(TheUser, getenv("EXT"), MAX_BUFF);
scopy(TheDomain, getenv("HOST"), MAX_BUFF);
-----snip------
should looks like
------snip------
scopy(TheUser, getenv("EXT"),.......
scopy(TheDomain, getenv("HOST"),........
lowerit(TheUser);
lowerit(TheDomain);
------snip------
then recompile, and put vdelivermail in the right place.
I hope it helps you,
Ralf Pachali