simmail docs
Connect your app, write to simulated people, and test what happens after the send.
Start here
Section titled “Start here”QuickstartSign up, send your first email and wait for the reply, in about five minutes.
Core vocabularyUniverses, people, logins, the clock and the World, in one page.
SMTP and IMAPHost, ports, TLS and logins for your app.
Sending from common stacksNode, Python, Ruby, PHP and more.
Learn the concepts
Section titled “Learn the concepts”PeopleTemperaments, hours, life, and how they decide to reply.
The simulated clockRun live, speed up, or skip ahead days in a second.
Junk and spam consequencesHow a spam score sends your mail to a person's junk folder.
The World moduleCompany mailboxes and mail that arrives on its own.
Build and test
Section titled “Build and test”The wait APIBlock in a test until mail or a reply arrives.
SDKsJavaScript and Python clients for your test suite.
Chaos and faultsGreylisting, rate limits and bounces on demand.
Connect an AI agent (MCP)Give your agent people to email over MCP.
API referenceEvery endpoint of the universe API.
WebhooksTell your systems when mail arrives, people reply or faults fire.