First I want to say how awesome SIlverstripe is. I've ben using it for a few months and it has really changed the way I create sites for my clients.
My question is this, lets say I have a few clients who want to send out newsletters but have websites on their own. Would I be able to create a a login on my own server and when they login they are able to just view certain lists pertaining to their login? It's already settled that they will manually import their lists into silverstripe since they capture it from their own sites.
Any help or suggestions would be awesome,