Resend

Communication API key

Send transactional email and manage domains, audiences and contacts from any Windmill script, flow or app.

Set up in 3 steps

Create an API key

In the Resend dashboard, open API Keys and create one. Copy it — it is shown only once.

Add the resource in Windmill

Open Resources, add a resource of type resend, and paste the key.

Run your first script

Fork the send email script below. Until a domain is verified, Resend only accepts its own test sender address.

Scripts

Building blocks, if none of the projects above fit. Fork one, run it, or call it as a step inside your own flow.

Resource type

resend — the shape of the credential every script on this page expects.

View raw schema →

Field	Type	Required	What it is
token	string	Yes

Questions

My send is rejected

Almost always the sender domain. Resend requires it verified before it will send from it — until then, only its test address works.

Can I restrict the key?

Yes. Resend keys can be created with sending access only, rather than full access, which is what most scripts need.

Is my key stored on the hub?

Never. It lives only in your own Windmill workspace, encrypted at rest.

Set up in 3 steps

Create an API key

Add the resource in Windmill

Run your first script

Scripts

Retrieve a list of contacts

Remove an existing audience

Retrieve a single contact

Create a new contact

Retrieve a list of audiences

Remove an existing contact by email

Create a list of contacts

Update an existing domain

Remove an existing contact by id

Retrieve a single audience

Update a single contact

Send an email

Retrieve a single domain

Create a new API key

Retrieve a list of API keys

Remove an existing domain

Verify an existing domain

Retrieve a list of domains

Retrieve a single email

Remove an existing API key

Trigger up to 100 batch emails at once.

Create a new domain

Resource type

Questions