I don't know how it got marked as a bad site, but Dyn has many very widely used services and I don't think anyone has had issues with them.
Spammer : send unsolicited emails to non optin addresses
I don't really want to mark it as a good or a bad site, but it is the site Bioware uses for some of its mailing. All of The Old Republic's beta test invites were sent out with links through this site.
Good site. BioWare uses it to send emails.
Bioware email messages
spam emails for "conferences", possible malware/pups
Unsolicited spam on a non opt-in email address.