https://mandrill.zendesk.com/hc/en-us/articles/206251597-Wha...
> What types of email can I send with Mandrill?
> But you can send any legal, non-spam email through Mandrill, too.
> What types of email can I send with Mandrill?
> But you can send any legal, non-spam email through Mandrill, too.
It seems like this change is to avoid being on the hook for those non-{legal, non-spam} emails.