IDN Domain
This site (mansur.moscow) has a mirror - (мансур.москва).
It is IDN (International Domain Name) with Cyrillic letters.
Under the hood this cyrillic name translated to (xn–80axemem.xn–80adxhks).
I’ve registered it in purpose to see how mail routing works with non-latin domain.
While initial testing done several years ago (during working at KL), there’s still a plan to maintain this domain just for fun.