Evening! I'm going to need to integrate our pipedrive with some kind of newsletter/email system ..

I'm trying to gather my thoughts as to exactly how to get what I need:
We have customer organisations tagged as Customer, inside organisations we have numerous people. How can I use Pipedrive to create and maintain segments in a tool like MailChimp (though I'm not wedded to MailChimp, if there's a better option) ..

I'm thinking a custom field with multi choice options like "marketing" "billing" "technical" "updates" to define which segments they should be in ..

I need to 'push' those segments out to email software, and also back to pipedrive if a customer opts out of a particular segment at a later date.

Can you suggest the best approach? Thanks!