Start Warm-Up

patch

https://app.mailivery.io/api/v1/campaigns/{campaignId}/start-warmup

Begin warm-up sending for a connected mailbox (campaign). Before sending starts, Mailivery verifies both SMTP and IMAP connectivity — if either check fails, warm-up will not start and you'll need to update the mailbox credentials and retry. Use this endpoint for a brand-new campaign, or after a pending Microsoft mailbox has finished OAuth consent.

📘
After starting warm-up, set your volume and schedule — see Recommended Warm-Up Settings.

Responses

📘After starting warm-up, set your volume and schedule — see Recommended Warm-Up Settings.

200Email warm-up has been started. Mailivery will send the number of emails set as 'email per day'.

400Campaign is already warming up — no action needed.

404Campaign not found.

503Due to an internal error, the campaign warm-up could not be started. Please try again later or contact the Mailivery Support team.

4XXCampaign warm-up could not be started due to an invalid SMTP or IMAP connection. In this case, update the campaign details and try again.

📘
After starting warm-up, set your volume and schedule — see Recommended Warm-Up Settings.