It may be taken as now settled that where an offer is made and accepted by letters sent through the post, the contract is completed the moment the letter accepting the offer is posted: Harris's Case; Dunlop v Higgins, even although it never reaches its destination.
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 Insurance Company v Grant (1879) 4 Ex D 216 and Henthorn v Fraser 1892 2 Ch 27.
Dunlop | John Higgins | John Higgins (snooker player) | Dunlop Tyres | Bernardo O'Higgins | O'Higgins Region | Missy Higgins | O'Higgins | Dunlop Rubber | Brian Higgins | Terrence Higgins Trust | Mary Higgins Clark | Henry Higgins | Alex Higgins | William Dunlop (footballer) | William Dunlop | Ross Higgins | Kevin O'Higgins | John Michael Higgins | John C. Higgins | John Boyd Dunlop | Joey Dunlop | Higgins Industries | Fort Dunlop | Eugene Higgins | E. Tory Higgins | Dunlop Sport | Dan Higgins | Colin Higgins | Chuck Higgins |