[vchkpw] Possible problem with nested pipes in vpopmail 5.4.18?

Hi All; I've been banging my head against this for a while now and I think I've tracked down the problem. I've written a small script to live in .qmail-default. This script is interpreting the error code that is being provided it by another program to something more familiar to qmail, and the

[vchkpw] Consecutive hyphens in domain part of sender address are bad?

I'm having trouble with domain names in the sender address that have two or more consecutive hyphen/dash characters ("-"). I'm using chkuser v2.0.8 in a qmailtoaster v1.3.13 installation. Here's what shows up in the qmail smtp log: 2007-09-27 06:07:28.019162500 CHKUSER rejected sender: from <