I've been noting an increase in spam threads with the [Solved] prefix with zero replies. I've hit a few in the last couple of days it seems.
The latest one "How to install games in Mac book" sadly had 70 views and was in general for 2 hours with a ton of links to TV shows. Seems like a success for a spammer having that many links visible for such a long time.
When I send emails from an account that is associated with an add-on domain on my shared hosting account (Bluehost) to a mailbox in the primary domain, they get tagged as spam. This is of course even more of a problem when sending to the outside world from such an add-on domain mail address.
An account at our host sends spam permanently. There is a block system via time like a user can send 100 mail in an hour. So this spam spents sending rights in a hour and the real users cannot send because of the block system.