mailbox rule

noun
mail·​box rule

Legal Definition of mailbox rule

: a rule treating the sending of something as constituting a filing or as a basis for assuming receipt specifically : a rule in contract law: a notice of acceptance of an offer sent to the offeror by reasonable means or as agreed by the parties is effective and is not affected by a notice of revocation of the offer received later

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“Mailbox rule.” Merriam-Webster.com Legal Dictionary, Merriam-Webster, https://www.merriam-webster.com/legal/mailbox%20rule. Accessed 24 Jul. 2021.

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