1BitcoinEaterAddressDontSendf59kuE is a valid address that can receive funds. It was created by making up the data portion of the address "BitcoinEaterAddressDontSend" and appending the appropriate checksum ("f59kuE"), which means that the private key is not known (and given the length of the vanity portion on the address, it is infeasible to find) and therefore nobody can spend funds received to it.