I am using the API to remove suppressed email addresses from my own system, however once removed I want to clear them from Campaign Monitors Lists, including the suppression list. How can I do this?
It is not currently possible to explicitly remove subscribers from the suppression list via the API. You are obviously able to add a subscriber and resubscribe them, which will remove them from the suppression list.
The ability to explicitly remove subscribers from the suppression list via the API isn't highly requested, but I've added your vote to our internal request tracker.
Sorry it's been a long time coming, but we're happy to announce that we've implemented the ability to unsuppress an email address (remove an email address from a client's suppression list) in the Campaign Monitor API.
Please be sure to check out the docs for full details.