Anti-Spam Act of 2003

Anti-Spam Act of 2003 - Prohibits a person from initiating in interstate commerce any commercial electronic mail (commercial email) message unless the message contains: (1) identification as commercial email; (2) notice of an opt-out opportunity, along with an email address or other mechanism for doing so; and (3) a valid physical street address of the sender. Prohibits the transmission of commercial email: (1) after valid objection; (2) with false or misleading header information or subject headings; (3) from illegally harvested email addresses, including addresses generated by automated means; or (4) without warning labels on commercial email containing sexually oriented material.

Provides a right of enforcement action for: (1) providers of Internet access service; (2) States on behalf of any of their residents; and (3) the Federal Trade Commission (FTC).

Amends the Federal criminal code to provide criminal penalties for: (1) falsifying the identity of a commercial email sender; (2) failing to place warning labels on commercial email containing sexually oriented material; (3) repeat offenses and bulk email violations; and (4) illegal harvesting of email addresses. Provides for enforcement of such penalties through actions by Internet service providers, the FTC and the Attorney General, and State attorneys general.

Requires the FTC to report to Congress regarding the need to protect the rights of users of email to avoid receiving unsolicited commercial email.