System & Package Architecture

MailPort is architected as a modular TypeScript monorepo with clean separation of concerns.

Package Boundaries

• @mailport/core: Zero-dependency engine defining core contracts, validation, address parsing, and error primitives.
• @mailport/mime: Bounded-memory streaming MIME generator returning AsyncIterable<Uint8Array>.
• @mailport/smtp: Reliable SMTP transport with STARTTLS, SASL, and dot-stuffing.
• @mailport/testing: In-memory transport and inbox for network-free testing.
• mailport: Unified umbrella SDK re-exporting all packages for onboarding simplicity.