Last week I created a script for finding which TLD's have MX records. Result:

    cf: ["mail.intnet.cf."]
    gp: ["ns1.nic.gp."]
    gt: ["aspmx.l.google.com.", "alt1.aspmx.l.google.com.", "alt2.aspmx.l.google.com.", "aspmx2.googlemail.com.", "aspmx4.googlemail.com.", "aspmx5.googlemail.com."]
    hr: ["alpha.carnet.hr."]
    km: ["mail1.comorestelecom.km."]
    mq: ["mx1-mq.mediaserv.net."]
    mr: ["mail.nic.mr."]
    tt: ["ASPMX.L.GOOGLE.COM.", "ALT1.ASPMX.L.GOOGLE.COM."]
    ua: ["mr.kolo.net."]
    ws: ["mail.worldsite.ws."]
    موريتانيا: ["mail.nic.mr."]
    عرب: ["your-dns-needs-immediate-attention.عرب."]

PS: Only http://uz/ seems to have a "working" HTTP server, returning the 500 status code.