Configure MTA to receive mails for any domain

[Nguyen Tam Chinh]

Hello,

This may be not a standard requirement for MTA, but I wanna configure
a MTA (sendmail, postfix, ...) to receive emails for any domain (It
means I want to catch all emails that go to the MTA). This is use for
a spamer detecting project.
In sendmail or posfix  we must make a list of accepted domains so that
I found no solution for this so far.
Any help is appreciated.
Thank you.

-- 
With best regards,        |         The Power to Serve
Nguyen Tam Chinh      |      http://www.FreeBSD.org