Gentlemen
Begin with "Dear sirs".
The ideal way to address a committee would be "Dear members of the committee" or "Dear Sirs"
what is the proper way to address the mayor
The proper way to address the conductor of a symphony orchestra is 'Maestro.'
the proper way to address the Queen is by "your majesty" or Ma'm, pronounced like "ham'
"Your honor"
usted. or ustedes.
The proper way to address a Doctor of Osteopathic Medicine (DO) (not Doctor of Osteopathy) is Doctor (Dr.) since they are medical physicians.
Master John Doe
What is the proper way to address a meeting location in the Board Room of a building
The proper way to address a mailing envelope is to place the stamp at the top right corner, add the senders return address on the top left corner of the envelope with the recipients full name and address in the middle of the envelope.
The correct way to address a gift is "Mr. & Mrs. James Smith". The couple is already married so it is proper to address it this way.