The classic non-sexist general salutation is "To Whom It May Concern:" It is also acceptable to use "Ladies and Gentlemen:" (my personal preference) or any other polite non-sexist phrase that is appropriate to your audience -- "To The Recipient Of This Letter:" or "Dear Recipient:" If you have any information about the nature of your recipient(s), you can use it to narrow the generality of your salutation -- "Dear Admissions Counselor:" or "To The Customer Service Staff:" or "Dear Service Representative:" or "Dear Animal Welfare Supporter:"
The proper salutation for a retired General is "General (Retired)" or "General Smith (Retired)" when addressing them formally.
In the UK a magistrate is addressed as your Worship.
When addressed by their rank alone, they are addressed as "Private."
A letter would be addressed to Mr. and Doctor. If they are both Doctors it would be Doctor and Doctor.
His/Her Excellency
Judges should be addressed, "your honor".
A Lt. Colonel is addressed as "Dear Colonel"; shouldn't a Lt. Governor be addressed as "Dear Governor"?
A Lt. Colonel is addressed as "Dear Colonel"; shouldn't a Lt. Governor be addressed as "Dear Governor"?
The envelope would be addressed as: The Honorable John Smith United States Senate Washington D. C. 20515 In letter: Dear Senator, or Dear Senator Smith
Except in an academic setting, she will usually be addressed as Mrs. rather than as Dr.
To whom it may concern
Rabbi and Mrs.