tips needed regarding mailing using CI

[eluser]wascko[/eluser]
hmmmm...

thanx for the advice, i was afraid i'd get this kind of reaction
:-)

However i can't see those mailings as mailing to seperate mailinglists because the recipients can be a different selection of members at any time.
Members are in region groups, and have checked some interests.
I can't make a mailinglist for every possible combination of this criteria.
This means i would have to find a mailingservice that is able to send a mail to a given array of mailadresses rather than a fixed list of mailinglist subscribers.
I am looking for a reliable mailingservice that can do this as we speak..

thanx
Wascko