Answer: spambots

AnswerCrossword Clue
SPAMBOTSAutomated address collectors
SPAMBOTSAutomated in-box cloggers
SPAMBOTSMass junk mailers
SPAMBOTSUnwanted forum visitors
SPAMBOTSJunk dealers?
spambotsSPAMBOT, a computer program that sends out unsolicited e-mail