DashaMail webhooks
Paste the same URL into every DashaMail webhook slot. Outreach reads event from the body and updates the Delivery log.
Auth is not an HTTP header. DashaMail sends
secret in the POST body as md5(email + message_id + Webhook-ключ). Put the UI «Webhook ключ» into Outreach env DASHAMAIL_WEBHOOK_HMAC_SECRET.