1. In addition to other requirements established by Community law, Member States which permit unsolicited commercial communication by electronic mail shall ensure that such commercial communication by a service provider established in their territory shall be identifiable clearly and unambiguously as such as soon as it is received by the recipient.

2. Without prejudice to Directive 97/7/EC and Directive 97/66/EC, Member States shall take measures to ensure that service providers undertaking unsolicited commercial communications by electronic mail consult regularly and respect the opt-out registers in which natural persons not wishing to receive such commercial communications can register themselves.