MailKit 2.6.0

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 SCRAM-SHA-256, SCRAM-SHA-1, NTLM, DIGEST-MD5, CRAM-MD5, LOGIN, PLAIN, 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, 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.

Requires NuGet 2.12 or higher.

Install-Package MailKit -Version 2.6.0
dotnet add package MailKit --version 2.6.0
<PackageReference Include="MailKit" Version="2.6.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add MailKit --version 2.6.0
The NuGet Team does not provide support for this client. Please contact its maintainers for support.

Release Notes

* Properly handle connection drops in SmtpClient.NoOp() and NoOpAsync() methods.
* Improved default SSL certificate validation logic to be more secure and to recognize the most commonly used mail servers even if their Root CA Certificates are not available on the system.
* SslHandshakeException's Message has been improved to be based on the errors reported in the ServerCertificateValidationCallback and also now has 2 new X509Certificate properties which represent the ServerCertificate and the RootCertificateAuthority in order to help developers diagnose problems. (issue #1002)
* Improved the IMAP PreviewText to extract text from HTML bodies. (issue #1001)
* Renamed MessageSummaryItems.Id to MessageSummaryItems.EmailId to better map to the property name used in the IMAP OBJECTID specification.
* Updated NetworkStream.ReadAsync() and WriteAsync() methods to make use of timeouts. (issue #827)

API Changes Since 2.0.x:

* Obsoleted SearchQuery.HasCustomFlags() and SearchQuery.DoesNotHaveCustomFlags(). These are now SearchQuery.HasKeywords() and SearchQuery.NotKeywords(), respectively.
* Obsoleted SearchQuery.DoesNotHaveFlags() in favor of SearchQuery.NotFlags().
* Obsoleted the IMessageSummary.UserFlags property in favor of IMessageSummary.Keywords.
* Obsoleted the MessageFlagsChangedEventArgs.UserFlags property in favor of MessageFlagsChangedEventArgs.Keywords.
* All IMailFolder.Fetch and IMailFolder.FetchAsync methods that took a HashSet<string> userFlags argument now take an IEnumerable<string> keywords argument. Note: this only affects you if your code used named method parameters (e.g. userFlags: myUserFlags).

Note to users upgrading from MailKit 1.x:

In order to authenticate using the XOAUTH2 SASL mechanism, you must now use the following approach:

client.Authenticate (new SaslMechanismOAuth2 (username, auth_token));

Showing the top 10 GitHub repositories that depend on MailKit:

Repository Stars
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nopSolutions/nopCommerce
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OrchardCMS/OrchardCore
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 application framework.
abpframework/abp
Open Source Web Application Framework for ASP.NET Core
win-acme/win-acme
A simple ACME client for Windows (for use with Let's Encrypt et al.)
jstedfast/MailKit
A cross-platform .NET library for IMAP, POP3, and SMTP.
simplcommerce/SimplCommerce
A simple, cross platform, modularized ecommerce system built on .NET Core

Read more about the GitHub Usage information on our documentation.

Version History

Version Downloads Last updated
2.6.0 188,895 4/4/2020
2.5.2 133,965 3/14/2020
2.5.1 204,162 2/15/2020
2.5.0 209,439 1/18/2020
2.4.1 450,340 11/10/2019
2.4.0.1 47,029 11/5/2019
2.4.0 8,069 11/3/2019
2.3.2 145,780 10/12/2019
2.3.1.6 333,660 9/9/2019
2.3.1 15,976 9/8/2019
2.3.0 270,157 8/24/2019
2.2.0 776,136 6/11/2019
2.1.5.1 296,585 5/13/2019
2.1.4 238,423 4/13/2019
2.1.3 459,697 2/24/2019
2.1.2 510,487 12/30/2018
2.1.1 100,160 12/17/2018
2.1.0.3 63,976 12/7/2018
2.0.7 202,557 10/28/2018
2.0.6 606,493 8/4/2018
2.0.5 213,477 7/7/2018
2.0.4 297,014 5/25/2018
2.0.3 295,291 4/15/2018
2.0.2 98,416 3/18/2018
2.0.1 575,122 1/6/2018
2.0.0 55,081 12/22/2017
1.22.0 241,234 11/24/2017
1.20.0 185,121 10/28/2017
1.18.1.1 422,597 9/4/2017
1.18.1 8,621 9/3/2017
1.18.0 111,789 8/7/2017
1.16.2 320,929 7/1/2017
1.16.1 297,636 5/5/2017
1.16.0 66,474 4/21/2017
1.14.2 35,783 4/12/2017
1.12.0 102,640 3/12/2017
1.10.2 103,659 1/28/2017
1.10.1 146,738 12/4/2016
1.10.0 359,866 10/31/2016