Would you be requiring someone to put the token in the body of the
message? That's seems a high onus on the sender. You might want
to make the token part of your email address, perhaps with the
plus syntax. Also, the decrementing counter seems pretty easy
to spoof/abuse. I'd be inclined to just get another email
address, and control who gets access to it. Finally, you can
look into the many spam filtering services already available,
which, when set as "pessimistic" as possible, will catch well
over 90% of your spam.
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