Is “Outbox” a Scrabble word?
Yes
OUTBOX
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Outbox
/aʊtˈbɒks/
noun
1.A box holding papers to be transmitted to others, eg, by mail.
2.An electronic folder serving the same purpose, for electronic mail.
verb
1.To box better than.