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Create an API key in Resend’s API Keys page. Prefer Sending access, restricted to the intended domain when possible, for a mail-only workflow. Use Full access only when the agent needs other supported account operations. An Administrator opens Connectors → Connect → Resend, enters a label and the key into the secure form, and saves. Nuphos probes its permission level and stores it encrypted. A sending-only key is not an invalid key merely because it cannot list domains.

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Sending email

Select the binding and give the exact recipients, sender, subject and content. The sender must be allowed by the key and your verified domain configuration. Sending is an external action that cannot be recalled; approve that specific message rather than granting an open-ended recipient list. For setup verification, inspect the recorded permission and domain information available to your key. Send a test only when you have explicitly requested it and named the recipient. An API accepting a send is not proof of final delivery.

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Troubleshooting and revocation

Check the sender domain, key permission, recipient and delivery status before retrying a send; duplicate retries can send duplicate mail. Remove the binding in Nuphos and revoke the key in Resend when retiring it. Previously sent mail and provider logs remain. See Resend key permissions.