In the security industry, it is quite common for publishers to re-sell emails on their list to third party advertisers. Indeed, it is a very lucrative business as each email run can cost advertisers thousands of dollars.
To be very clear, we have never done that nor would we ever do that.
Today, I received a very interesting email from a security trade magazine with a strange announcement. They have (or were) opting my email into being resold to third party advertisers but were providing a link to opt-out. All things considered, this is not too horrible considering most just silently resell without any notice.
I was curious to your experience with your email being resold / receiving advertisements from other companies you have not signed up for? Is this a problem or concern?