I was reading CAN-SPAM and I came across the definition of "electronic mail message" in 15 USC § 7702(6)
> The term “electronic mail message” means a message sent to a unique electronic mail address.
Note that it doesn't specify anything about SMTP or any specific email protocols besides the address. I wonder if messaging systems that use email addresses as identifiers might unintentionally be subject? E.g. Ads shown through Facebook custom audiences with email address lists.
> The term “electronic mail message” means a message sent to a unique electronic mail address.
Note that it doesn't specify anything about SMTP or any specific email protocols besides the address. I wonder if messaging systems that use email addresses as identifiers might unintentionally be subject? E.g. Ads shown through Facebook custom audiences with email address lists.