Queues a connection health check for every mailbox in the authenticated user's team that is not already flagged with connection problems.

For each eligible mailbox, Mailivery verifies SMTP/IMAP (or OAuth) connectivity in the background. When auto_restart=true (the default), mailboxes that are currently paused due to a previous connection problem are automatically restarted once the recheck succeeds.

The endpoint returns immediately with a queued-confirmation response; the actual rechecks run asynchronously.

Rate limit: 3 calls per 2 hours, per team. Exceeding this returns 429 TOO_MANY_REQUESTS.

Scope: Only mailboxes owned by the authenticated user's team are affected.