Resend test environment for email workflows
Test email agents and applications that send, receive, schedule, and track transactional messages.
Meet the Resend twin
Validate single, batch, scheduled, received, and templated email workflows. Replay email automation without delivering messages to real recipients.
Seeded state
Seed domains, contacts, segments, topics, templates, sent and received emails, broadcasts, suppressions, webhooks, events, and automations.
Interfaces
Use Resend in staging without using production.
Validate single, batch, scheduled, received, and templated email workflows
Seed domains, contacts, templates, messages, broadcasts, and webhook state
Replay email automation without delivering messages to real recipients
Provision the Resend twin from the CLI.
Install the Arga CLI, sign in once, then create a 60-minute twin run. The command waits until the environment is ready and prints its connection details.
Terminal
$ uv tool install arga-cli$ arga login$ arga twin-runs create --twins resend --ttl 60 --waitAdd --scenario-prompt to describe the state the twin should start with.
Build with the Resend twin
Connect the twin, seed realistic state, and run scenarios against a resettable service.
