If the offer or circumstances do not indicate otherwise, the means the offeror used to communicate the offer is the impliedly authorized means for accepting.

Question

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If the offer is made through a particular means of communication (such as email, fax, or mail), it is implied that the offeror authorizes the offeree to use the same means to accept the offer, unless otherwise specified or the circumstances indicate otherwise. This is known as the "mailbox rule."

If the Offer or Circumstances Do Not Indicate Otherwise, the Means