Maybe his reply settings and actual email are different? That happend to me just the other day when I set up a new computer at work. People could send to me direct, but not reply to a message.
ETEK 3LT, with 14" Ti boomstick and cure 3 + bolt F/S
Vanguard creed eyes, membrane, bolt pin, detents F/s[/color]
Old school angel poppets/cup seals, spring detents(not sure which models) F/S