There is a newer version of this package available.
See the version list below for details.

Requires NuGet 2.12 or higher.

Install-Package MimeKit -Version
dotnet add package MimeKit --version
<PackageReference Include="MimeKit" Version="" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add MimeKit --version
The NuGet Team does not provide support for this client. Please contact its maintainers for support.
#r "nuget: MimeKit,"
#r directive can be used in F# Interactive, C# scripting and .NET Interactive. Copy this into the interactive tool or source code of the script to reference the package.
// Install MimeKit as a Cake Addin
#addin nuget:?package=MimeKit&version=

// Install MimeKit as a Cake Tool
#tool nuget:?package=MimeKit&version=
The NuGet Team does not provide support for this client. Please contact its maintainers for support.

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

NuGet packages (112)

Showing the top 5 NuGet packages that depend on MimeKit:

Package Downloads

MailKit is an Open Source cross-platform .NET mail-client library that is based on MimeKit and optimized for mobile devices. Features include: * HTTP, Socks4, Socks4a and Socks5 proxy support. * SASL Authentication via ANONYMOUS, CRAM-MD5, DIGEST-MD5, LOGIN, NTLM, OAUTHBEARER, PLAIN, SCRAM-SHA-1, SCRAM-SHA-256, SCRAM-SHA-512 and XOAUTH2. * A fully-cancellable SmtpClient with support for STARTTLS, 8BITMIME, BINARYMIME, ENHANCEDSTATUSCODES, SIZE, DSN, PIPELINING and SMTPUTF8. * A fully-cancellable Pop3Client with support for STLS, UIDL, APOP, PIPELINING, UTF8, and LANG. * A fully-cancellable ImapClient with support for ACL, QUOTA, LITERAL+, IDLE, NAMESPACE, ID, CHILDREN, LOGINDISABLED, STARTTLS, MULTIAPPEND, UNSELECT, UIDPLUS, CONDSTORE, ESEARCH, SASL-IR, COMPRESS, WITHIN, ENABLE, QRESYNC, SORT, THREAD, ANNOTATE, LIST-EXTENDED, ESORT, METADATA / METADATA-SERVER, NOTIFY, FILTERS, LIST-STATUS, SORT=DISPLAY, SPECIAL-USE / CREATE-SPECIAL-USE, SEARCH=FUZZY, MOVE, UTF8=ACCEPT / UTF8=ONLY, LITERAL-, APPENDLIMIT, STATUS=SIZE, OBJECTID, REPLACE, SAVEDATE, XLIST, and X-GM-EXT1. * Client-side sorting and threading of messages (the Ordinal Subject and the Jamie Zawinski threading algorithms are supported). * Asynchronous versions of all methods that hit the network. * S/MIME, OpenPGP, DKIM and ARC support via MimeKit. * Microsoft TNEF support via MimeKit.


netDumbster is a .Net Fake SMTP Server clone of the popular Dumbster (http://quintanasoft.com/dumbster/) netDumbster is based on the API of nDumbster (http://ndumbster.sourceforge.net/default.html) and the nice C# Email Server (CSES) written by Eric Daugherty.


MsgKit is a 100% managed C# .NET library (no PINVOKE or whatsoever) which may be used for the creation of messages (E-Mail, Appointments, Journals and Stickey Notes) that are Outlook compatible


Orchard Core CMS is a Web Content Management System (CMS) built on top of the Orchard Core Framework. Implementation for OrchardCoreCMS Infrastructure


FMPC is a service with utilities such as standard messages, document validators and CDN for images and PDF.

GitHub repositories (25)

Showing the top 5 popular GitHub repositories that depend on MimeKit:

Repository Stars
Store securely encrypted backups in the cloud!
Orchard Core is an open-source modular and multi-tenant application framework built with ASP.NET Core, and a content management system (CMS) built on top of that framework.
Clean Architecture Template for Blazor WebAssembly Built with MudBlazor Components.
smtp4dev - the fake smtp email server for development and testing
A .NET MIME creation and parser library with support for S/MIME, PGP, DKIM, TNEF and Unix mbox spools.
Version Downloads Last updated
3.0.0-preview1 1,154 10/8/2021
2.15.1 78,005 9/13/2021
2.15.0 392,842 8/19/2021
2.14.0 251,897 7/28/2021
2.13.0 773,479 6/12/2021
2.12.0 487,498 5/12/2021
2.11.0 969,798 3/12/2021
2.10.1 1,733,271 12/5/2020
2.10.0 813,050 11/21/2020
2.9.2 1,786,697 9/12/2020
2.9.1 1,721,600 7/11/2020
2.8.0 1,483,283 5/30/2020
2.7.0 183,066 5/19/2020
2.6.0 2,299,691 4/4/2020
2.5.2 586,794 3/14/2020
2.5.1 898,436 2/15/2020
2.5.0 647,815 1/18/2020
2.4.1 1,392,655 11/10/2019 102,281 11/5/2019
2.4.0 25,547 11/3/2019
2.3.2 322,635 10/12/2019
2.3.1 872,087 9/8/2019
2.3.0 502,003 8/24/2019
2.2.0 1,666,844 6/11/2019 727,773 5/13/2019
2.1.4 475,440 4/13/2019
2.1.3 930,681 2/24/2019
2.1.2 908,522 12/30/2018
2.1.1 158,313 12/16/2018
2.1.0 280,680 12/1/2018
2.0.7 258,349 10/28/2018
2.0.6 1,497,240 8/4/2018
2.0.5 375,058 7/7/2018
2.0.4 445,952 5/21/2018
2.0.3 401,574 4/14/2018
2.0.2 140,683 3/17/2018
2.0.1 1,063,269 1/6/2018
2.0.0 128,430 12/22/2017
1.22.0 381,654 11/24/2017
1.20.0 289,886 10/28/2017
1.18.1 546,196 9/3/2017
1.18.0 162,208 8/7/2017
1.16.2 380,809 7/1/2017
1.16.1 405,475 5/5/2017
1.16.0 104,315 4/21/2017
1.14.1 42,467 4/9/2017
1.14.0 98,671 4/9/2017
1.12.0 171,268 3/12/2017
1.10.1 134,348 1/28/2017
1.10.0 583,095 10/31/2016

* Updated the BouncyCastle assemblies to version 1.8.5 for iOS and Android.
* Fixed a possible NullReferenceException when decoding S/MIME digital signatures.
* Fixed the netstandard2.0 dependencies to no longer explicitly include System.Net.Http. (issue #482)
* Override Equals(object) and GetHashCode() for InternetAddress and InternetAddressList. (issue #481)
* Fixed TnefReader.Dispose() to avoid a potential NullReferenceException if double disposed.
* Fixed the Message-Id, Content-Id, References and In-Reply-To parsers to be more liberal in what they accept in terms of the `msg-id` token.
* Changed the Header encoding logic for the In-Reply-To header to not rfc2047 encode the value even if it is longer than the suggested line-length. (issue #479)
* Reduced netstandard dependencies. (issue #475)