Commercial Email and Spam:
In 2008, the District of Columbia enacted the Spam Deterrence Act of 2008, which prohibits sending commercial email with false identifying information or a false subject line, as well as the deceptive use of a third party's internet address, domain name, or other identifying information. This Act is codified at District of Columbia Code, Title 28, Subtitle II, Chapter 50 (§§ 28-5001 - 28-5003).
Telemarketing & Telephonic Anti-Solicitation:
In 1991, the District of Columbia enacted a law banning the use of automated dialing or push-button telephone systems with pre-recorded messages for commercial solicitation or surveys. This law is codified at District of Columbia Code, Title 34, Subtitle V, Chapter 17 (§ 34-1701).
The District of Columbia also criminalizes telemarketing fraud, and requires registration of telephone solicitors. See District of Columbia Code, Title 22, Subtitle I, Chapter 32, Subchapter III-B (§§ 22-3226.01 - 22-3226.15).
Unlawful Trade Practices:
The District of Columbia Consumer Protections Procedure Act includes a prohibition of certain unlawful trade practices, none of which specifically includes spam email. See District of Columbia Code, Title 28, Subtitle II, Chapter 39 (§ 28-3904).