no
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.
Dear Sirs:
What i know in French is Monsieur et Dames
Dear Sirs,
Begin with "Dear sirs".
The ideal way to address a committee would be "Dear members of the committee" or "Dear Sirs"
You could write "Dear Sirs and Madam" in a business letter, or you could write "Dear Friends" in an informal letter.
dear Sirs:
Dear Sirs, Dear Sirs, is outdated in today's business world, where nearly 50% of the workforce is female. A better option is to address the group as a whole, or write the same letter and have an individualized copy go to each recipient.
Dear Sirs / Messr's / John Doe and Jim Smith, ESQ.
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.
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.