uSMTP Toolkit by Cypherbridge Systems is a lightweight embedded SMTP client software solution designed for sending TLS secure email to any server. It enables devices to send periodic status reports, telemetry data, alarm conditions, and various data payloads to synchronize device information securely with cloud services. The toolkit implements RFC standards-based SMTP, allowing interoperability with proprietary SMTP relays, sendmail servers, and public SMTP services, including GoDaddy and Gmail. It provides connectivity capabilities in both non-TLS and TLS modes, supporting non-TLS, TLS explicit STARTTLS, and TLS implicit SMTPS modes for secure communication. The toolkit is designed for small-footprint applications and includes a variable length message mode for real-time synchronization of large data sets without buffering large email payloads.
