I tell my clients that they should comply with CAN SPAM (physical postal address and unsubscribe option) even if the mail they are sending is technically exempt. The bar for legality is so low, there is no reason not to.
Sure, there is a lot of spam out there that does not comply with CAN SPAM. Everything you see from botnets and proxies is in violation, although many of those mails do actually meet the postal address and unsubscribe requirements.
One of my spams recently caught my eye today with their disclaimer on the bottom: “This email message is CAN SPAM ACT of 2003 Compliant.” The really funny bit is that it does not actually comply with the law. Even better, the address it was sent to is not published anywhere, so the company could also be nailed for a dictionary attack and face enhanced penalties.
It reminds me of the old spams that claimed they complied with S.1618.
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