The highly customizable ruby SMTP-Server and SMTP-Service library with builtin support for AUTH and SSL/STARTTLS, 8BITMIME and SMTPUTF8, IPv4 and IPv6 and additional features.
Auto-discovery agent for TLS certificates. Scans your local IPv4/IPv6 network and static hosts for HTTPS, SMTPS, IMAPS, and more. Reports certificate metadata via Webhook. Supports TLS, STARTTLS, SNI, and protocol tagging. You can't protect what you don't know you have.