Contracts/Mailbox rule

The mailbox rule is A rule of providing that an acceptance of an offer become effective on dispatch (on been placed in an official mail box), if mail is expressly or impliedly, an authorize means of communication of acceptance to the Offeror. So an acceptance is valid when it is dispatched which means at the time the mail is place into the control of the U.S. Postal service Not when it is received by the offeror. An acceptance becomes effective on dispatch (even if it is never received)