A few days ago (11-10-13) Newsletter’s “Feed by Mail” began sending the feed newsletter to all emails in the database whether they were confirmed, not confirmed or unsubscribed. I removed unsubscribed and unconfirmed emails from the database so users wouldn’t be sent unwanted newsletters, keeping from being tagged as a spammer.
We only use the “Feed by Mail” feature so I am unsure if this would effect standard Newsletters.