CIPS Exam L4M3 Topic 6 Question 25 Discussion

When parties do not negotiate face-to-face, a key Question: becomes when

things like acceptances, rejections and revocations take effect. The general rule is that acceptances are effective on dispatch (when they are mailed). Everything else becomes effective when the offeror actually receives them. This idea is codified by the ''mailbox rule'' which states that acceptance is effective on dispatch, even before the offeror has received it. (The one minor exception to this rule involves option contracts for which acceptances are not effective until they are received by the offeror.)

- The Mailbox Rule

- CIPS study guide page 34