Is it Mr and Mr or Mssrs?

Answer:
Mrs.

Edit - if you're talking about addressing a letter to two men - it's 'Messieurs'. For example - Messieurs Smith and Jones. --Snakester1962 (Supervisor)

Re-Edit-- Mssrs. is an acronym for Messieurs and is acceptable in print... but that doesn't mean most people will understand you. "Mr. Smith and Mr. Jones" would be more readily understood.
Contributor: Ryan
First answer by Theprismgroup. Last edit by Ryan Schoon. Contributor trust: 0 [recommend contributor recommended]. Question popularity: 1 [recommend question].