Safelists work much the same way as traffic exchanges. If you did not read yesterdays post on traffic exchanges, you can see it HERE.
With safelists, rather than surfing via a website, you are clicking links in emails to receive credits. These credits are then used to send emails to other members of the safelist.
Again, what and how you promote with safelists makes all the difference. Promoting a business opportunity is not the best use of these services.
Instead, you need to know your target market and provide something they need. Keep in mind, most people using safelists are not network marketers. They are internet marketers promoting various affiliate products and programs.
What these people really need is someone to show them how to do the same amount of work and get paid on it for years, but that's for another time.
For now, find what they are looking for, be it traffic generation, seo tools or whatever. Get to know these people and build those relationships.
You never know what each new connection may bring.