Section 5

An acceptance may be revoked at any time before the communication of the acceptance is complete as against the acceptor, but not afterwards.

A proposes, by a letter sent by post, to sell his house to B.

B accepts the proposal by a letter sent by post.

A may revoke his proposal at any time before or at the moment when B posts his letter of acceptance, but not afterwards.

B may revoke his acceptance at any time before or at the moment when the letter communicating it reaches A, but not afterwards.

Revocation how made