mailing list bounces

[tek@undergroundinfection.net (tek@undergroundinfection.net)]

I don't remember when i got these but at some point in the past week or so
i received these messages in my mail log report:
  1     1.30  66.92.236.195 does not like recipient./Remote host said: 450
<bclug.org-request@lists.sitelink.com>: Recipient address rejected:
Greylisted for
300 seconds (see
http://isg.ee.ethz.ch/tools/postgrey/help/lists.sitelink.com.html)/Giving
up on
66.92.236.195./
  1     0.58  66.92.236.195 does not like recipient./Remote host said: 450
<bclug.org@lists.sitelink.com>: Recipient address rejected: Greylisted for
300
seconds (see
http://isg.ee.ethz.ch/tools/postgrey/help/lists.sitelink.com.html)/Giving
up on
66.92.236.195./
  1     0.77  66.92.236.222 does not like recipient./Remote host said: 450
<tdiehl@rogueind.com>: Recipient address rejected: Greylisted for 300
seconds (see
http://isg.ee.ethz.ch/tools/postgrey/help/rogueind.com.html)/Giving up on
66.92.236.222./

Anyone have any ideas on how to go about making them disappear?