Rosa sends an offer to Keelan that requires acceptance to be made by US mail. Keelan accepts in a timely manner, but send the acceptance by FedEx, which delivers the acceptance to Rosa two days faster than US mail would under a traditional common law rules has Keean accepted roses offer? Yes, since accept it sent in any form even if earlier delay, confirms the offer. The note since acceptance was delivered by private rather than public delivery service say yes, since FedEx was mail no since it offer a particular manner of exception that was not used.