jstedfast/MailKit
A cross-platform .NET library for IMAP, POP3, and SMTP. observed · 2026-08-28
Health v2 · maintenance only
76/100
- Activity 98
- Release rhythm 35
- Longevity 100
Flags: no_releases
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.
- gap_med: n/a
- age_days: 4652
- days_rel: n/a
- days_push: 14
- n_releases_24m: 0
Adoption not part of the score
6844 stars · 866 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded
MailKit is a cross-platform .NET mail client library built on top of MimeKit, providing IMAP, POP3, and SMTP support along with a high-performance MIME parser. It supports S/MIME, OpenPGP, DKIM, and ARC for secure email handling.
Use cases
- send and receive email in a .NET application
- parse email messages from files or streams
- connect to an IMAP or POP3 mailbox from C#
- sign and encrypt email with S/MIME or OpenPGP
- verify DKIM signatures on incoming mail
- parse a Unix mbox file in C#
- build a cross-platform mobile email app
When to choose
- you need robust, high-performance email handling in .NET
- you need IMAP/POP3/SMTP client functionality with MIME support
- you need email encryption, signing, or DKIM/ARC verification
- you need a library that runs on Windows, Linux, macOS, iOS, and Android
When to avoid
- you need a mail server rather than a client library
- you are not on a .NET platform
- you only need simple SMTP sending and prefer a minimal dependency
Facets
library · maturity stable
email parser cryptography http-client email developer-tools security cross-platform dotnet cross-platform windows mime imap smtp pop3 dkim smime openpgp c-sharp linux macos android ios
5 sources
- readme: https://github.com/jstedfast/MailKit · fetched 2026-08-28 · 1fbc4e58ee96
- homepage: http://www.mimekit.net · fetched 2026-08-29 · d0244e6a4814
- site_page: https://mimekit.net/docs/html/Parsing-Messages.htm · fetched 2026-08-29 · e0ca0691ddc3
- site_page: https://mimekit.net/docs · fetched 2026-08-29 · a1b0716a5a55
- site_page: https://mimekit.net/docs/html/Working-With-SMime.htm · fetched 2026-08-29 · 403299079b12
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| jstedfast/MailKit | main | 76 |
For agents
markdown · JSON · MCP: product_card(name="jstedfast/MailKit")
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem