Answer: emailing

AnswerCrossword Clue
EMAILINGSending on an impulse?
EMAILINGTerminal activity
EMAILINGContacting via the Net
EMAILINGActivity for some pen pals
EMAILINGWriting in a window?
emailingSend (a message) by e-mail
emailingSend an e-mail to (someone)
emailingthe act of sending electronic mail