Does your ESP automatically authenticate all domains?
No. Most ESPs require manual authentication configuration for custom sending domains. You must add **DNS** records (**SPF**, **DKIM**) according to their instructions.
Some ESPs handle authentication differently. Some send from their domains by default. Others require custom domain setup. Understand your **ESP**'s model.
Follow your **ESP**'s authentication setup documentation. Verify authentication passes through testing. Do not assume automatic configuration without verification.
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