Equivalent to Bukkit's OfflinePlayer list?

Right now I’m working on a server mail plugin. Of course, players can also send mails to offline players.

I want to check if the player name entered by the player is a registered Minecraft profile name and if the player has played before on the server.

These kind of methods are also important for plugins which only store the UUID of a player
(e.g. /lastonline <offline-player>).

I searched the SpongeAPI code for a method to get the GameProfile/User of an offline player, but did not find one.

I couldn’t find on or remember one either. File it as an issue and someone will look into it.