Searching first for the documentation, and then for the author of a Perl module I was working with, I eventually found this rant:
But that’s not the best part. The best part was the end of the message. First there were some mail addresses. Of the kind you send a complaint or unsubscription request to and you get a new flood of spam, since now they know there IS someone sitting at the other end.
[ … ]
So according to this “responsible” person, it’s OK to post some nonsense to thousands of completely uninterested people, but it’s “SPAMing” if they dare to complain. Sweeeeet.
Well, I just want to make the following note to the author: in Brazil, they speak Portuguese! Only. They do not speak Spanish (that’s just the rest of south and centre America!)