Some of these were blacklisted recently, but perhaps shouldn't be. Do you have any information about these domains?

tim.com.br

7 year old domain, but I can't read Portugese. What do they do? Is it possibly legitimate?

callin.net

Korean tech site of some kind. 5.5 years old.

ivyro.net

Korean, 2.5 years old.

drugstorebestbuys.com

Sells prescription drugs. Obviously very high spam potential, but has been around for about 4 years.

bgreetings.com

Greeting cards. Also potentially spammy, but more than 4 years old.

Jeff C. -- Don't harm innocent bystanders.