qmail aliases fail; chkuser 2.0.9 + vpopmail 5.4.25

I have several domains hosted via vpopmail, and I use
chkuser 2.0.9 to block dictionary-attack spam.

chkuser appears to have broken my ability to use
qmail's "dash aliases" for vpopmail domains. For example,
if I had a vpopmail account called "[email protected]",
prior to chkuser I was able to send mail to
"[email protected]" and it would be delivered to
the "[email protected]" Maildir.

After installing chkuser 2.0.9, this feature stopped
working.

chkuser 2.0.9 appears supports dash aliases by default.
This is the relevant line from chkuser_settings.h:
#define CHKUSER_ENABLE_ALIAS

But this doesn't seem to work for vpopmail-hosted
domains -- only for the domain that is hosted natively
within qmail (listed in /var/qmail/control/locals).

The specific problem this causes me now is that
ezmlm-idx mailing lists cannot be used for vpopmail
domains, because ezmlm relies on dash aliases. For
example, a moderation reply address looks like:
  [email protected]
whereas the delivery address is actually:
  [email protected]

Subscription confirmation requests are similarly broken.

Is chkuser known to support qmail aliases within
vpopmail?

Related to the above, is chkuser 2.0.9 known to be
compatible with ezmlm-idx 7.1.1?

Thank you.

--
matt.

!DSPAM:4dbe6d7d32712061814254!