Spam Laws - sites and summary

Spam Laws
For law on Spam, US, Europe and other countries.
Summary:
1. Give clear and conspicuos notice of the opportunity to opt-out.
2. Provide a functionaing opt-out in every commercial e-mail.
3. Provide a valid physical postal address of the sender.
4. Use an authentic, non-misleading subject line.
5. Use a consistent "from address" - Reverse DNS
6. Include valid contact info.