I have no idea why the following TLD have a MX record on the root level of the zone. This does not make sense at all.
Does this show the technical incompetence of the NIC? Please comment If I'm wrong.
(At least Postfix looks not to be able to send to postmaster@ai because it automatically appends localdomain.)
Test it yourself with "dig mx ai" for example.
.AI => mail.offshore.AI.
.AS => dca.relay.gdns.net.
.BJ => mail6.domain-mail.com.
.CF => mail.intnet.CF.
.DJ => smtp.intnet.DJ.
=> relais2.intnet.DJ.
.DM => mail.nic.DM.
.GP => ns1.nic.GP.
=> ns34259.ovh.net.
=> manta.outremer.com.
.HR => alpha.carnet.HR.
.IO => mailer2.IO.
.KH => ns1.dns.net.KH.
.KM => mail1.comorestelecom.KM.
.MH => imap.pwke.twtelecom.net.
.MQ => mx1-mq.mediaserv.net.
.NE => bow.rain.fr.
=> bow.intnet.NE.
.PA => ns.PA.
.TD => mail.intnet.TD.
.TT => 66-27-54-142.san.rr.com.
=> 66-27-54-138.san.rr.com.
.UA => mr.kolo.net.
.VA => proxy2.urbe.it.
=> john.vatican.VA.
=> paul.vatican.VA.
=> lists.vatican.VA.
.WS => mail.worldsite.WS.
.TD => mail.intnet.TD
.YE => mail.yemen.net.YE.