I applaud your attempt to create an environment less
friendly to spammers. However, I feel that the suggested registration fee of
$2000 puts implementation of the .mail domains beyond the reach of most small
businesses, myself included. I currently host my own domains, both .com and
.net, but adding .mail would be too expensive, even though I would qualify by
all other proposed tests. I would suggest a tiered approach, based on the
number of unique email addresses coming for any given registered .mail domain.
Since the mail servers must test against a list of valid domains, it shouldn’t
be difficult to add a recipient hash and tally unique values. When registering
a .mail domain, the administrator could include a number of unique users. If
the number of user hashes exceeds the registered quantity, the test response could
reject additional hashes or, as a more stringent deterrent, reject all mail originating
from that domain.