How to backhole mail?

Hi,

For one of my projects I'm setting up a server to test the total
number of SMTP connections that our postfix server can handle. I am
trying to isolate the first part of the smtp server transaction up to
the recipient server receiving the message i.e. the end of the smtp
transaction. Afterwards I would like to discard the message (send it
to /dev/null or something), so that the message doesn't place any
extra strain (cpu cycles, disk i/o) on the system.

How do I set up an Postfix server so that it accepts mail for any
domain, any username and then simply deletes the message (sends it to
/dev/null)?

Than you,
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Srđan Đukić