An open source alternative to proprietary SMTP libraries like MailKit for server-side implementation. It provides a modular architecture for building custom mail transfer agents with native TLS and rate limiting.
Tech Stack
C#Backend & Auth
Why Zetian?
• High throughput
• Native TLS/SSL support
• Clean extensible API
Limitations
• Requires deep SMTP protocol knowledge
• No built-in UI
• Limited to .NET ecosystem
3/1/2026
Last Update
2
Forks
0
Issues
MIT
License
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Competitor Cost
-$1,440
/ year (est. based on SendGrid (Internal SMTP Logic))
