@MojangSupport I am asking for a friend but what should he do, if doen't know the email he used to create his minecraft account with?
Please have them submit a request to us with an email they can access, and confirm as much info about the account as possible (username/transaction ID/purchase date/etc). They can contact us here https://help.minecraft.net/hc/en-us/requests/new … and we will assist as soon as possible. ^SA