He's not listed on IMDb, but I'm pretty sure that the man receiving his "air mail" (or "fan mail") is stuntman/actor
Jimmie Dundee.
(In terms of films discussed on this forum, he shows up in a couple of Laurel and Hardy's Fox features, as a mess hall draftee in GREAT GUNS and as the cop who slips on the banana peel in THE DANCING MASTERS.)