That would not work, unless I make each person a separate list.
E.g. Mailing 1 goes to even numbered list members, Mailing 2 goes to odd numbered list members.
E.g. On signup, people can specify if they are interested in Subjects A, B, C, D...
Certain issue of news letter has only topics A, and D. I want to be able to send to groups A and D.
But I don't want to send to groups A and D separately because someone who is in both groups would then get 2 copies.
On a recent trade show, I gave people the choice of 8 topics. I got just about every combination possible. I don't think my users would be pleased at having to go through 8 different signups.
User 1 wants A+C+D User 2 wants C+E User 3 wants everyhing User 4 wants C D E...
With 8 topics there are 2^8 possible combinations.
J. Random User originally signs up with topics A, C, F, and R. After a year he's no longer interested in F.
It's actually to avoid possible complaints that I want this functionality. I want each user to be able to tune the newsletter for his specific interests.
Thus the interface on his opt-in page has a list of interests. And he can come back to that page to refresh, modify his interests.