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Connections and services

Setting up email delivery with Resend

You create an API key at Resend, store it under Connections, and then monitor status and sending domains directly in MainPath.

On this page

Resend is integrated into MainPath as its own connection type. You store only an API key; MainPath handles sending through SMTP (smtp.resend.com, user resend), the status display, and the monitoring of your sending domains.

flowchart LR
  cred["Organization's Resend connection"]
  svc["Your project's backend"]
  api["Resend API / SMTP"]
  mx["Recipient's mail server"]
  svc -->|"reads credentials"| cred
  svc -->|"API key"| api
  api --> mx

For a different provider, create a generic Email (SMTP) connection instead; Email delivery describes the differences.

Preparing at Resend

  1. Create an account at resend.com or sign in.
  2. Under Domains, enter your sender domain and set the displayed DNS records for SPF, DKIM, and DMARC at your domain provider; sending is only enabled after verification. You can also take care of this step later from within MainPath.
  3. Under API Keys, create a key and copy it.

Creating the connection in MainPath

  1. Open Connections in the sidebar and click Add connection.
  2. Choose the Resend tile.
  3. Enter the API key, optionally with a sender name and a sender address from your verified sending domain.
  4. Save. The connection is then available in projects under Mail account.

Monitoring status and domains in MainPath

The Resend connection’s tile opens its detail view with the status of the connection, your sending domains with their verification status, and for each domain the DNS records with type, name, value, and check status. With Add domain you create new sending domains right here.

Selecting the mail account in the project

When editing the project, select the Resend connection under Mail account in the backend’s settings. Resend, SendGrid, Mailtrap, and SMTP connections are listed there together.

If something does not work

If the status shows an error, check the API key and create a new one at Resend if necessary. If Resend rejects sending or mail does not arrive, the sending domain is usually not verified yet; compare the DNS records in the detail view with those at your domain provider. If a domain is missing from the list, create it with Add domain and set the displayed records.

See also