How are Relay Hub and Relay Client different?

A compatible WordPress hub accepts signed HTTPS submissions and operates the mail stack. A client connects selected domains over HTTPS/443 without a second local agent or Postfix installation. Credentials are scoped to the exact WordPress site URL and sender domain.

Inbound gateway permission is separate from outbound submission rights. Where configured, the hub receives, filters, applies SRS and forwards mail using the client’s verified forwarding policy. Hub operation remains your infrastructure responsibility.

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