Firstly, if you are sending mail to "members", it implies that what you are sending is not spam. Presumably, if sombody signed up as a member, then they know what you plan to do and are expecting emails. If you send secondary emails only to those who respond to your first round of emails, then it is likewise not spam.
Not withstanding all of the above, everything you propose to do is possible and I would be happy to do it for you.
Sincerely,
Hoppy