Mailhook and Resend: Auto-Acknowledge Inbound Email Template

A Spojit workflow that catches a forwarded customer email and instantly replies with a branded acknowledgement sent from your own domain through Resend.

What It Builds

A Mailhook trigger gives you a unique Spojit address you forward customer mail to. The moment a message arrives, the workflow reads the sender, subject, and reply-to, then a Connector node on the Resend connector uses send-email to fire back a same-minute acknowledgement from your verified domain. The reply goes to {{ input.replyTo }} so the original sender always gets a confirmation that you received their message, even before a human looks at the inbox.

The Prompt

Paste this into Miraxa and it builds the workflow, connecting the tools for you:

Build a workflow that triggers on a Mailhook address. When a customer email arrives, send an acknowledgement email back to the sender from my verified domain using the Resend connector. The reply subject should be "Re: {{ input.subject }}" and the body should thank them by referencing their message, confirm we received it, and tell them we will respond within one business day. Send it to {{ input.replyTo }}.

Connectors Used

  • Mailhook trigger - generates a unique @mailhook.spojit.com address you point customer mail at; fires a run within seconds of each message.
  • Resend connector - sends the branded acknowledgement from your own verified domain with the send-email tool.

Customize It

Change the body wording in the prompt to match your brand voice and response-time promise (for example "within 2 hours" instead of "one business day"). You can also adjust the subject line, add a signature, or tell Miraxa to set the from-name to your support team. To skip auto-replies on out-of-office bounces or no-reply senders, add a line asking for a Condition node that only sends when {{ input.replyTo }} looks like a real customer address.

Tips

  • Verify your sending domain in Resend before going live, otherwise send-email will reject the message. The Resend connection holds the API key for the verified domain.
  • Keep the Resend node in Direct mode. The reply is a single predictable call, so you avoid AI credit cost and get the same result every time.
  • Add a From allowlist or Subject regex on the Mailhook trigger so only genuine forwarded customer mail starts a run and you do not acknowledge spam.

Related

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