Two acceptable abbreviations for the plural of Ms. are Mses. or Mss. If you aren't comfortable with that format or the two females have different last names, you may address them individually:
Ms. Mary Smith and Ms. Jane Jones; Dear Ms. Smith and Ms. Jones,
Mss. Mary Smith & Jane Jones; Dear Mary Smith & Jane Jones,
Prof. Mary Smith and Dr. Jane Jones; Dear Prof. Smith and Dr. Jones,
Mses. Mary & Jane Smith; Dear Mary & Jane Smith,
Mary Smith and Jane Jones; Dear Ms. Smith and Ms. Jones,
the correct salutation for two men is Messrs
If you want to play it safe, stick to "ladies". If the situation is casual and they are your age or younger, or if they are older but you think they would appreciate the flirtation, you can try "girls", but do so at your own risk
If their surname were to be Mooney - - the Misses Mooney
Using junior or senior in a salutation letter should only be done if these two words are a part of your name and you use it daily. The same rule goes for who the letter is for.
There are at least two correct ways to formally address two married doctors: 1. The Doctors Michael and Mary Smith (preferred); 2. Dr. Michael and Dr. Mary Smith (feminist).
In speech? Probably "Madam, sir, sir." In a letter, what sort of a household are you writing to? For such a configuration, I'd begin any letter simply as "dear friends" or "dear three musketeers" and leave it at that.
Mr. Rick Miles and Mr. Denny Neessen
dear Sirs:
salutation
There are at least two correct ways to formally address two married doctors: 1. The Doctors Michael and Mary Smith (preferred); 2. Dr. Michael and Dr. Mary Smith (feminist).
The salutation of a letter addressed to two men named Smith is:Dear Messrs. Smith,The plural of Mr. is Messrs. from the abbreviation of French messieurs (which is the plural of monsieur).
The sender's name typically appears two lines below the last line of the message in a letter.