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Advantages for spam senders via emails?
. low cost compared to previous models
. potential profits (even if small percentage relpy)
. wide reach
Disadvantages for spam senders via email?
. legal risks in some countries
. reputation damage
. low success rate
Other forms of spam other than email?
. door-to-door salesmen
. junk mail
. fax spam
What is meta-spam?
Spam that does not have message in itself, purely for detecting active email addresses
e.g. Sign up newsletter
Disadvantage for the receiver?
. annoyance
. cost of time and resources
. having to put up with a DDOS style attack