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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 (more than 25x faster than OpenPOP.NET and over 100x faster than AE.Net.Mail and MailSystem.NET).

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 massive limitations or bugs.

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

To install MimeKit, run the following command in the Package Manager Console

Install-Package MimeKit -Version 1.16.1

Requires NuGet 2.12 or higher.

Release Notes

* Fixed TextToHtml and FlowedToHtml's OutputHtmlFragment property to work.
* Fixed EncodeAddrspec and DecodeAddrspec to handle string.Empty. (issue #302)
* Allow string.Empty as a valid addrspec for MailboxAddress. (issue #302)
* Catch exceptions trying to import CRLs and Certs when verifying S/MIME signatures. (issue #304)



Jeffrey Stedfast


Xamarin Inc.



Version History

Version Downloads Last updated
MimeKit 1.16.1 (this version) 51,905 Friday, May 5, 2017
MimeKit 1.16.0 23,667 Friday, April 21, 2017
MimeKit 1.14.1 16,338 Sunday, April 9, 2017
MimeKit 1.14.0 10,846 Sunday, April 9, 2017
MimeKit 1.12.0 49,393 Sunday, March 12, 2017
MimeKit 1.10.1 62,684 Saturday, January 28, 2017
MimeKit 1.10.0 278,548 Monday, October 31, 2016
MimeKit 1.8.0 116,484 Sunday, September 25, 2016
MimeKit 1.6.0 76,878 Sunday, September 11, 2016
MimeKit 1.4.2 151,446 Sunday, August 14, 2016
MimeKit 1.4.1 173,985 Sunday, July 17, 2016
MimeKit 1.4.0 101,742 Friday, July 1, 2016
MimeKit 1.3.0-rc1 32,934 Sunday, May 22, 2016