John Levine wrote:
They still provide free service but you have to set up an account and get an access key to use in the queries, which is not hard. (I've done it.) You get enough queries for a small mail system. If you query more than that they'll rate limit you and someone will contact you suggesting you upgrade to a paid account.
You only need an account and query key if you're using some of the newer, more specialized sublists.
Querying the public nameservers continues to work just fine for the longer-standing IP and domain/URI sublists if you run your own cache. (As a mail server operator, you ARE running your own cache, right?)
-kgd
