Dropping bounced confirmation requests

First of all: wow!  I can't wait to use this program!  I've been setting
it up on a different user account so I can try it out, and most things
are going well.

I am having some difficulty understanding how to stop postmaster getting
my bounced confirmation requests, though.  I followed this FAQ entry:

http://wiki.tmda.net/TmdaFaq#head-2f0fc68e5357f633123128481b6f4642279b6957

>From reading this entry, I'm assuming it's possible to use an address
such as <username>-devnull@<domain> to capture the bounces.  I've set
BOUNCE_ENV_SENDER to the equivalent of that for my test account and
added the rule ``to [email protected] drop'' to my incoming
filter file.

When I send a message to [email protected], the confirmation process
seems to work fine.  However, when I send mail to
[email protected], I get a challenge back -- I was expecting all
mail that goes there to be, well, dropped!

Something tells me I'm missing something obvious, but I can't work out
what, from reading the (very good!) documentation.  If someone here
could point me in the right direction, that'd be great.

I did see one reference when Googling somewhere to problems with Exim or
Postfix when trying to do stuff like this; I'm not sure if they still
apply or not, but it is probably worth mentioning that I am using
Postfix (2.1).

best regards,


-- 
Matthew T. Atkinson <[email protected]>