Grunger, I've never used full stops on Mr, Mrs or Miss. I've never thought it necessary - in fact, I've never given it a moment's thought! (Incidentally, I seldom use Mr, Mrs or Miss anyway - most of my letters get sent to John Smith or J. Smith, Mary Brown or M. Brown.) 'Esq.' and 'Esquire' are redundant as far as I'm concerned.
You'll be pleased to hear that I did agree with some of Jacob's 'rules'. I'd be happy to see weasel words, such as 'unacceptable' disappear completely. The same goes for phrases such as 'note/understand your concerns'. These are so over-used that they are now virtually meaningless.