When is an agreement complete if you receive an offer with no stipulations and return your acceptance by mail?

An agreement is considered complete when acceptance is placed in the mail by the offeree, following the postal service's mailbox rule. This principle states that an acceptance is effective at the moment it is sent, as long as it is communicated in a manner that was intended by the offeror, which in this case includes no stipulations regarding the mode of acceptance.

In this scenario, since the offer has no specific conditions for how acceptance should be communicated, the offeree's act of mailing the acceptance serves as a clear indication of agreement to the terms proposed. Therefore, the agreement forms at the point of dispatch rather than at the point of receipt by the offeror, which underscores the importance of timely communication in contract formation.