Using safelists is simply e-mailing your advertisement to others without the threat of spam (unsolicitated e-mail). This is accomplished by joining safelist groups who have agreed to receive your advertisement. Like all other members of a safelist group, you agree to receive other members ads.
You have to remember to be careful about how many safelists you join. Remember, if you join a list that has 5000 people in it, it's great that your ad is getting to those 5000 people but THEY will be putting ads out too...to the list. And YOU are now on that list. This means hundreds of e-mail ads sent to YOUR e-mail box from them.
russ20