A more thorough explanation:

Commercial Email and Spam: Minnesota has a law that prohibits false or misleading commercial email messages. If an email contains sexually explicit content, the subject line must include "ADV-ADULT." However, this requirement is likely overridden by the federal CAN-SPAM Act of 2003, which has its own rules for pornographic commercial emails.

Telemarketing & Telephonic Anti-Solicitation: Until 2012, Minnesota had a "Do Not Call" list that prevented telemarketers from calling people who had registered their phone numbers. However, this law expired in 2012. Minnesota also has strict rules about using automated devices for telemarketing purposes.

Faxes, Texts, and Other Media Anti-Solicitation: Minnesota's "Junk Fax Law" prohibits sending unsolicited advertisements via fax machine unless the sender includes a toll-free number that recipients can use to opt-out of future faxes. The sender must also include an address where the recipient can opt-out of future faxes.

For example, if a company sends a fax advertisement to a business without permission, they must include a toll-free number and an address where the business can opt-out of future faxes. This law helps prevent unwanted fax advertisements from clogging up fax machines and wasting paper.