post
https://app.mailivery.io/api/v1/campaigns/sendgrid
Connect a mailbox (campaign) that sends through SendGrid. SendGrid handles outbound delivery via its API, while IMAP is used for the reply inbox — so you supply your SendGrid SMTP credentials alongside standard IMAP settings for the receiving side. On success, Mailivery returns the new campaign object with its id, which you'll use for all subsequent warm-up operations.