DockYard/elixir-mail is an Elixir library for building, parsing, and rendering email messages according to RFC 2822 and related MIME standards. It provides a composable API to create simple and multipart email messages, handle various transfer encodings (Base64, Quoted-Printable, 7bit, 8bit, binary), and parse incoming email into structured data. The library is structured around a core `Mail.Message` struct with separate modules for encoding, parsing, rendering, and MIME type lookup. It does not require any external runtime dependencies beyond the Erlang/OTP standard library.