Dear Sirs and Madams, is the way one would head a semi formal letter. There are countless different ways to start a letter depending on who it is being sent to.
If you are addressing several men and women in a letter, then the salutation can be 'Dear Ladies and Gentlemen'. Another salutation can be 'Sirs and Madams'. These types of salutations can be used for men and women that are on a committee.
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Dear Sirs:
Dear Sirs,
It seems only if your familiar, as 'dear' is a familiar term.
Dear Sirs and Madam:
comma or colon Examples: Dear A n na, Dear Sirs:
Dear Mr. Smith and Mr. Jones or Dear Sirs as an example
The ideal way to address a committee would be "Dear members of the committee" or "Dear Sirs"
Begin with "Dear sirs".
dear Sirs:
If you don't know their genders - address it Dear Sirs. If you do know their genders - address is Dear Mr X and Mrs Y.