I'm writing a letter to several recipients in the same document and want to address them correctly at the start.
Is the following correct (I suspect not) and if not, what should it be:
Dear Mr's Jones, Smith, Bloggs and Flintstone
The plural form of Mister is Misters, and the abbreviations Mr. and Messrs. respectively (although UK English drops the periods). The odd spelling is because "Messrs." comes from the French "messieurs". So your example would be phrased as:
Ms. is a bit more complicated; any of "Mses.", "Mss.", or "Mmes." (from the French "mesdames") are acceptable. If you use one of these, be consistent and don't randomly change to another form.
If it's mixed between two genders, use the appropriate honorific for each set and join them with "and". So for instance:
For addressing a married couple with the same surname, a variant may be employed.