2 ms·Theoretically a MX record on a TLD is valid, but I doubt many try to use that.by Avamander 5y agoTheoretically a MX record on a TLD is valid, but I doubt many try to use that.Ekaros 5y agoPerversely it depends. With older and country TLDs yes, with the new ones no... I'm not even joking... This isn't RFC, but ICANN...yakak 5y agoIndeed I couldn't find a brand TLD with an MX, but there does seem to be an MX on ua, so "support@ua" is a valid email with no "."..