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The best resolution to SPAM is to contact both your ISP and the spammer's ISP. As responsible providers, they should take appropriate action. To spam a spammer isn't great protocol.
Since spam (certain types) is illegal in Washington State (where I reside), I merely respond to the spammer, cc'ing their ISP, as follows:
Please note that the law forbids the transmission of certain types of
junk email from computers in Washington or to e-mail accounts held by
Washington State residents. Each message that violates the law entitles
minimum damages of $500 to individuals and $1,000 to Internet Service
Providers. The law also allows the Attorney General's Office to take
legal action.
If you do not remove me from your spam e-mail listing, you will be
reported to the Washington State Attorney General's Office and may
become subject to paying damages.