[Mailman-Users] VERP problem

[fmouse-mailman at fmp.com]

I admin nearly identical installations of mailman on two different servers. 
On both, I have the following set in mm_cfg.py:

VERP_PASSWORD_REMINDERS = Yes
VERP_PERSONALIZED_DELIVERIES = Yes
VERP_DELIVERY_INTERVAL = 1

On one system, running qmail as the MTA, VERP works as expected.  On the
other, running courier as the MTA (although qmail is installed as well), I
can't get mailman to use VERP at all.  Is it possible that the misbehaving
install won't do VERP because it doesn't recognize the SMTP daemon as being
VERP capable (which it is)?  Is there some other config variable I need to
set or something I need to do in the build to make VERP work as expected?

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