Add ability to sync to more than one Mailchimp list
At present the Mailchimp API only allows synchronisation with one list in Mailchimp (and, therefore, 60 groups).
However, this means that anyone who unsubscribes from that list will be excluded from all future emails we send out to the same list. While this works fine for marketing messages, we still need to email our members and customers with non-commercial messages about services they have paid for. Therefore, much of this will have to be handled manually or by bypassing the API altogether and importing lists into Mailchimp outside of Workbooks.
So if we were able to sync with multiple lists in Mailchimp, we could get around this problem and have separate unsubscribe options for member communication, our events & training, our newsletter and then email marketing.
We are making some changes to mailing list management in 2017. This may make it easier to integrate with more than one Mailchimp List