People with opt-in lists, Earthlink question
 

I read that Earthlink is now using challenge/response spam filtering. How are you dealing with this?

What is the "priotiy code" they are talking about here:

Standards call for messages from mailing lists to come with a priority code marked "list" or "bulk." EarthLink's software wouldn't challenge such messages.


http://www.salon.com/tech/wire/2003/...pam/index.html