Goodbye, Mr. Rosenstein
Thank you, Mr. Rosenstein
Regards, Mr. Rosenstein
Salutations, Mr. Rosenstein
Yours cordially, Mr. Rosenstein
Sincerely, Mr. Rosenstein
That’s the thing about commas in such cases, without context, one can’t know if it is a statement addressed to a person, or a signatory sign off by a person.
Everything posted can be interpreted two ways or more… kek.