I've decide to create a new term. I can't find this term used on web sites the way I envision it.
The term is "Spam Cast."
What is a Spam Cast?
It's an allusion to fishing in that we know we get offers for all sorts of stuff in email. Well if a company or spammer is actively seeking legitimate email addresses for use in other spam messages and/or a company or spammer is using what is ostensibly a legitimate method for obtaining patrons for legitimate purposes but then sells or distributes associated email addresses, then they are guilty of Spam Casting.
They've cast their fishing line into the river of the internet hoping to hook an official good email address for purposes of propagating spam.
What do you think?