As we mentioned earlier, cold emailing for B2B purposes is considered to be opt-in as long as your company is following the rules as stated in the CAN-SPAM Act of 2003, which dictates that all commercial email messages include an opt-out mechanism if someone wants to unsubscribe. When you buy opt-in mail lists, it's important to add the opt-out to your messages or else you could incur fines from the Federal Trade Commission (FTC).