MimeKit 2.1.1

There is a newer version of this package available.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 2.1.1
dotnet add package MimeKit --version 2.1.1
<PackageReference Include="MimeKit" Version="2.1.1" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add MimeKit --version 2.1.1
The NuGet Team does not provide support for this client. Please contact its maintainers for support.
#r "nuget: MimeKit, 2.1.1"
#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=2.1.1

// Install MimeKit as a Cake Tool
#tool nuget:?package=MimeKit&version=2.1.1
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 (110)

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 578 10/8/2021
2.15.1 58,294 9/13/2021
2.15.0 331,257 8/19/2021
2.14.0 238,362 7/28/2021
2.13.0 742,664 6/12/2021
2.12.0 475,739 5/12/2021
2.11.0 949,407 3/12/2021
2.10.1 1,701,722 12/5/2020
2.10.0 801,696 11/21/2020
2.9.2 1,764,408 9/12/2020
2.9.1 1,701,283 7/11/2020
2.8.0 1,460,682 5/30/2020
2.7.0 180,836 5/19/2020
2.6.0 2,269,810 4/4/2020
2.5.2 571,899 3/14/2020
2.5.1 890,221 2/15/2020
2.5.0 642,007 1/18/2020
2.4.1 1,383,475 11/10/2019 101,832 11/5/2019
2.4.0 25,454 11/3/2019
2.3.2 320,753 10/12/2019
2.3.1 867,628 9/8/2019
2.3.0 498,457 8/24/2019
2.2.0 1,658,767 6/11/2019 721,052 5/13/2019
2.1.4 472,788 4/13/2019
2.1.3 927,514 2/24/2019
2.1.2 905,221 12/30/2018
2.1.1 158,126 12/16/2018
2.1.0 275,835 12/1/2018
2.0.7 256,668 10/28/2018
2.0.6 1,491,200 8/4/2018
2.0.5 373,188 7/7/2018
2.0.4 444,720 5/21/2018
2.0.3 400,289 4/14/2018
2.0.2 140,330 3/17/2018
2.0.1 1,057,535 1/6/2018
2.0.0 128,204 12/22/2017
1.22.0 380,303 11/24/2017
1.20.0 289,408 10/28/2017
1.18.1 544,902 9/3/2017
1.18.0 161,777 8/7/2017
1.16.2 380,443 7/1/2017
1.16.1 404,452 5/5/2017
1.16.0 104,141 4/21/2017
1.14.1 42,369 4/9/2017
1.14.0 98,491 4/9/2017
1.12.0 171,002 3/12/2017
1.10.1 134,189 1/28/2017
1.10.0 582,003 10/31/2016

* Mapped the TNEF Sensitivity property to the Sensitivity message header when calling TnefPart.ConvertToMessage().
* Fixed the TNEF Importance and Priority mappings when calling TnefPart.ConvertToMessage().
* Added more TnefPropertyId's that have been identified.
* Map PidTagTnefCorrelationKey to the Message-Id message header.
* When the TNEF data does not have a SentDate property, set the MimeMessage.Date property to DateTimeOffset.MinValue instead of DateTimeOffset.Now.
* Fixed TnefPart.ConvertToMessage() to check the TNEF SubjectPrefix and NormalizedSubject properties and use them if a TNEF Subject property is not available.
* Fixed TNEF logic for extracting attachment content to not truncate some bytes from the beginning of the content.
* Added more fallbacks for attempting to extract the sender information out of the TNEF data.
* Bumped Android and iOS versions of BouncyCastle to v1.8.4.