[Mailman-Users] using an ORBS type lookup to auto reject posts

[Jeff DeReus]

Hello,

I was curious if there is some sort of mechanism in mailman 2.1.5 to reverse
lookup (?)  the poster via some sort of ORBS type database without manually
blacklisting all the different addresses that are out there.  Any help or
leads to documentation would be helpful.
Currently running sendmail with mailman.

Thank you,
Jeff D