The mailbox rule is a principle stating that the offeree's response operates as an acceptance only if it is the precise mirror image of the offer.

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The mailbox rule states that an acceptance is valid as soon as it is placed in the mailbox, regardless of when or whether it is received by the offeror. It does not require that the acceptance be the exact mirror image of the offer. However, if the acceptance has additional or different terms than those in the offer, it may be considered a counteroffer and not a valid acceptance.

The Mailbox Rule Is a Principle Stating That the Offeree's