1. Configure a clean email list.
2. Provide easy unsubscribe options.
3. Make your emails personal.
4. Check to see your emails' legality.
5. Register a subdomain and use it only for email activity.
6. Stick to a consistent send schedule.
7. Use a double opt-in or confirmed opt-in.
8. Check...
Nothing is more painful than losing your email address to due to being linked to spamming prospective end users of a service that you are rendering to make some good money online.
The worst case scenario is when you are still engaging a buyer through email and do not even have another means of...