Scilly Today reports that Islanders should get their mail and papers on time today (Mon. 3 Dec) as a temporary arrangement has been made to transport mail via Newquay Airport rather than Lands End Airport which has been closed due to waterlogging of the grass strip. Newspapers will also be routed through Newquay.
See the full Scilly Today
article here which includes deadlines for posting outgoing mail at St Mary's.