# Inert RFC email message composer

Build-time release reference. Runtime readiness, deployment, payment settlement and external indexing are not evaluated here. Prices are proposed; this file cannot authorize execution or payment.

WHEN TO USE: Create exact inert .eml message text from caller-supplied From, ordered To, UTC timestamp, Message-ID, subject and text. Restricted ASCII mailboxes, deterministic MIME Base64 UTF-8 body and safe folded encoded subjects. Does not send email, create mailbox drafts, authenticate identities, look up domains or promise delivery.

Release: 0.29.0. Built: 2026-10-06T15:38:00Z.

## Choose for
- Compose a complete deterministic .eml draft artifact for later caller-controlled import or transport
- Encode explicit sender, recipients, timestamp, message ID and plain text as an RFC MIME message

## Outside this profile
- Sending email, mailbox access, deliverability checks, DNS or authenticated sender identity
- HTML, attachments, display names, quoted mailboxes, groups, SMTPUTF8, Cc/Bcc, custom headers or DKIM
- Sending, uploading, extracting archives, writing files, authenticating identities, or changing external state

Proposed nominal USD 0.005 per successful call; payer fees excluded. No verified runtime availability.

- [Exact release contract](/reference/services/mime-email-compose.json)
- [Input schema](/reference/schemas/mime-email-compose.input.json)
- [Output schema](/reference/schemas/mime-email-compose.output.json)
- [Fixed example](/reference/examples/mime-email-compose.json)
- [Complete HTML reference](/discover/tools/mime-email-compose)