The rules of contracts by post postal rules includes the following:
1. An offer made by post/letter is not affective until received by the offeree.
2. Acceptance is effective as soon as it is posted.
3. For revocation to be effective, it must be received by the offeree before they post their letter of acceptance.
One rationale given for the rule is that the offeror nominates the post office as his or her implied agent, and thus receipt of the acceptance by the post office is regarded as receipt by the offeror. The main effect of the posting rule is that the risk of acceptance being delivered late or lost in the post is placed upon the offeror. If the offeror is reluctant to accept this risk, he can always expressly require actual receipt as a condition before being legally bound by his offer.
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