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Stalwart mail-send is a Rust library to build, sign and send e-mail messages via SMTP. It includes the following features: - Generates e-mail messages conforming to the Internet Message Format standard (RFC 5322). - Full MIME support (RFC 2045 - 2049) with automatic selection of the most optimal ... [More] encoding for each message body part. - DomainKeys Identified Mail (DKIM) Signatures (RFC 6376) with ED25519-SHA256, RSA-SHA256 and RSA-SHA1 support. - Simple Mail Transfer Protocol (SMTP; RFC 5321) delivery. - SMTP Service Extension for Secure SMTP over TLS (RFC 3207). - SMTP Service Extension for Authentication (RFC 4954) with automatic mechanism negotiation (from most secure to least secure): - Full async (requires Tokio). [Less]