Answer: mailin

AnswerCrossword Clue
MAILIN

Kind of ballot

MAILIN

Like some ballots

MAILIN

Submit via USPS

MAILIN
Submit, as a contest entry
MAILIN
Rebate card, e.g.
MAILINPost.
MAILINLike some questionnaires
MAILINRedeem, perhaps
MAILINKind of rebate
MAILINType of rebate
MAILINKind of campaign
MAILINSubmit via a stamped envelope
MAILINType of ballot
MAILINLike some rebates
MAILINSubmit with a stamp
MAILINLike many rebates
MAILINRemit, usually