Deliverability
Reputation, list quality, bounces, and inbox placement.
Required
Reverse DNS and sending identity
Every sending IP needs stable forward-confirmed reverse DNS, an SMTP greeting that matches it, and an operational domain identity.
RequiredRecipient list hygiene
Send only to expected recipients, remove permanent failures, suppress complainers, and stop mailing addresses that never engage or consent.
RequiredSpam complaint handling
Subscribe to available feedback loops, connect complaints to recipients safely, suppress them promptly, and monitor complaint rates by message stream.