MimeKit
All MimeKit releases at a glance: release dates, number of versions, latest version, LTS status and the end-of-life (EOL) visualisation
All supported productsFree Versio.io trialWhat is MimeKit?
MimeKit is an Open Source library for creating and parsing MIME, S/MIME and PGP messages
on desktop and mobile platforms. It also supports parsing of Unix mbox files. Unlike
any other .NET MIME parser, MimeKit"s parser does not need to parse string input nor
does it use a TextReader. Instead, it parses raw byte streams, thus allowing it to
better support undeclared 8bit text in headers as well as message bodies. It also
means that MimeKit"s parser is significantly faster than other .NET MIME parsers.
MimeKit"s parser also uses a real tokenizer when parsing the headers rather than regex
or string.Split() like most other .NET MIME parsers. This means that MimeKit is much
more RFC-compliant than any other .NET MIME parser out there, including the commercial
implementations. In addition to having a far superior parser implementation, MimeKit"s
object tree is not a derivative of System.Net.Mail objects and thus does not suffer
from System.Net.Mail"s limitations. API documentation can be found on the web at http://www.mimekit.net/docs
For those that need SMTP, POP3 or IMAP support, check out https://github.com/jstedfast/MailKit
MimeKit release and version history
| Release | Release date | Versions | Latest version | Latest version date | LTS |
|---|---|---|---|---|---|
| 4 | 2023-04-16 | 22 | 4.18.1 | 2026-09-19 | No |
| 3 | 2021-12-11 | 12 | 3.6.1 | 2023-03-19 | No |
| 2 | 2017-12-22 | 37 | 2.15.1 | 2021-09-13 | No |
| 1 | 2016-10-31 | 12 | 1.22.0 | 2017-11-24 | No |
Data as of 8 October 2026. Dates in ISO format (YYYY-MM-DD). Source: Versio.io product release & end-of-life database.
The entire lifecycle of the product MimeKit
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Facts and figures about MimeKit
| Product | MimeKit |
|---|---|
| Vendor | Jeffrey Stedfast |
| Latest version | 4.18.1 |
| Number of releases | 4 |
| Number of versions | 83 |
| Number of unstable versions | 0 |
| Number of versions affected by CVE | 78 |
| Licence | MIT |
| Licence details | https://www.nuget.org/packages/MimeKit/4.13.0/license |
| Version command | dotnet list package --include-transitive | findstr /i "MimeKit" |
Frequently asked questions about MimeKit end of life
What is the latest version of MimeKit?
The latest version of MimeKit is 4.18.1, released as part of the 4 release on 16 April 2023.
Does MimeKit have a fixed end-of-life schedule?
No. MimeKit does not publish fixed end-of-life dates. It follows a "latest version" model: only 4 is considered current. Earlier release lines (3, 2 and 1) remain usable but are superseded and no longer the recommended version.
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