21.1 All notices hereunder shall be in writing.
21.2 Notices shall be deemed to have been duly given:-
21.2.1 When delivered, if delivered by courier or other messenger (including registered mail) during normal business hours of the recipient; or
21.2.2 On the tenth business day following mailing, if mailed by airmail, postage pre-paid in each case addressed to the most recent address, e-mail address, or facsimile number notified to the other party.