Author: M.Prince (11 May 07 1:00pm)
A couple things.
1. We conduct regular tests to see if addresses constructed with 3-level, 4-level, or even greater domains receive less spam than 2-level domains. So far the answer has been a resounding no. There are plenty of organizations that use 3-level domains for their email addresses. For example, ATT, the largest ISP in the U.S., uses worldnet.att.net as their primary domain for customers.
2. We test newly donated domains to see how clean they are. A couple messages that arrive and appear to be dictionary attacks don't set off our virgin filter. What we want to make sure is that the domain wasn't previously used to sign up for legit mailing lists, etc. There's no harm in donating a domain and seeing what happens. If it doesn't pass the virgin filter, it won't go into the queue to be used to create addresses. If it does, then as a 2-level domain it will be a valuable addition.
Thanks for your help with the Project!