Regarding to this article,
I've 2 questions.
Q1: how to specify the client and its list, I see parameters here but the document didn't address on what are they?
from the Sample I know how to add John Smith:
But which list exactly it goes?
Q2: Looks like this way Hackers can use this and dump in Spam emails and we'll send it out for them if we're not aware
I actually answered your ticket that you sent in last week regarding this issue with specific parameters to your subscriber list. I'll send off another copy to you, but you may check your junk box to see if it got filtered.