 If the offeror is reluctant to accept this risk, he can always expressly require actual receipt as a condition before being legally bound by his offer.The rule was established by a series of 19th century cases, starting with "Adams v Lindsell" (1818) B & Ald 681, which was later confirmed and expanded in "Dunlop v Higgins" (1848) 1 HL Cas 381, "Household Fire and Carriage Accident Insurance Co Ltd v Grant" (1879) 4 Ex D 216 and "Henthorn v Fraser" [1892] 2 Ch 27.The posting rule applies only to acceptance.