Answer: optsin

AnswerCrossword Clue
OPTSIN

Decides to participate

OPTSIN

Decides to join

OPTSIN

Chooses to participate

OPTSIN
Chooses to get e-mail, maybe
OPTSIN
Chooses to take part
OPTSINDoesn't decline
OPTSINChooses to join
OPTSINAgrees to participate