delete
https://app.mailivery.io/api/v1/campaigns/146
Remove a mailbox (campaign) from Mailivery. Warm-up sending and reply handling stop immediately, stored credentials are discarded, and the campaign is excluded from future listings. Deletion cannot be undone — re-onboard the mailbox if you need to resume warm-up later.
Retrieve any history you need before you delete. Once a mailbox is deleted its campaignId no longer resolves, so the campaign-scoped reads — Get Metrics, Get Health Score and Get Activity Logs — no longer return its warm-up history.