I have a Mailchimp news list with about 5,000 users. I want to invite them to use my product, gradually in batches.
These batches will be pretty arbitrary - I want to invite people I know personally first, then some people who's volunteered to be beta testers, then maybe everyone from a particular country, etc.
My question is this: how can I keep track of who I've already invited and who I haven't, so I don't end up inviting the same people twice?
It looks as though I should set up a campaign for each batch.
But then once I've sent the emails for that campaign, how can I flag those users as having already been invited?
Maybe I need to make a segment for each campaign, and make sure users aren't in more than one segment?