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Every computer has an inbox at name@mail.cool.computer. The inbox stays with the computer until you delete it.

Send a task

Write a direct instruction from the email address on your Cool Computers account:
The agent inside the computer works in /home/runtime and replies to the thread with its result. Reply to the same thread when you want it to continue.

Who can start a task

Only mail from your verified account address can start work, and only when it carries a DKIM signature from that address’s own domain. Other messages reach the inbox but don’t run a task. Each email’s intake_outcome and intake_detail, in cool email read and the HTTP API, say why and what to do next.

Turn on DKIM for your own domain

New Google Workspace and Microsoft 365 domains don’t sign mail with their own domain until an admin turns it on: Google signs as *.gappssmtp.com and Microsoft as *.onmicrosoft.com. Your email then doesn’t start a task (rejected_owner_domain_unsigned), and Cool Computers replies with these steps, at most once an hour per computer. To check, send a test email to another mailbox and open the received copy’s original headers (in Gmail, More → Show original). Its Authentication-Results must show dkim=pass, and the d= of the matching DKIM-Signature must be your own domain; d=…gappssmtp.com or d=…onmicrosoft.com means domain signing is off.
  • Google Workspace: admin.google.com → Apps → Google Workspace → Gmail → Authenticate email → select your domain → Generate new record → add the TXT record it shows at google._domainkey.<domain> at your DNS provider → back in the console, click Start authentication. On a domain whose Gmail was turned on in the last 72 hours, Generate new record may not work yet; try again later. After Start authentication, signing can take up to 48 hours.
  • Microsoft 365: security.microsoft.com → Email & collaboration → Policies & rules → Threat policies → Email authentication settings → DKIM → select your domain. If no keys exist yet, click Create DKIM keys. Add the two CNAME records it shows at your DNS provider, then turn on Sign messages for this domain with DKIM signatures.
  • Other providers: turn on DKIM signing for your domain in your email provider’s settings.

Follow a task

Open Chats to follow the conversation started by your email. The reply also arrives in the original email thread. Reply to that thread to continue the task.

Read and send mail with the CLI

cool email bakery lists the newest mail, received and sent. reply answers one email in its thread. Every computer has an inbox, with or without a VM. Inside the computer, leave out its name: cool email send --to you@example.com --subject "Report" --text "Done.". The HTTP API and the MCP server also read and send mail. Obtain approval for the exact recipient and content before sending.