MailKit 3.2.0
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 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.
No packages depend on MailKit.
- Do not use ApplicationProtocols with SSL. (issue #1352)
- Updated GMail, Yahoo, and Outlook.com certificates.
- Lazy-initialize MessageSummary.Keywords. This reduces memory usage when the client isn't requesting Flags/Keywords.
- Hard-cache some IMAP FETCH-related tokens in order to relieve GC pressure for commands like FETCH where there can be a LOT of responses containing the same tokens over and over again.
- Converted some IMAP async Task methods to use ValueTask to reduce GC pressure.
- Reduced string allocations in the IMAP logic by avoiding use of ToUpperInvariant().
- Added non-async implementations for ImapStream APIs to be used by the synchronous public APIs to avoid some async overhead.
- Reduce MemoryStream (and thus byte[]) allocations by using a new ByteArrayBuilder.
- Rewrote the IMAP CAPABILITY parser to avoid allocating strings.
- Fixed some cases where IMAP NIL tokens were not compared case insensitively.
- Always include the VERSION block in NTLM messages. (issue #1340)
- Target .NET Framework v4.6.1 instead of v4.6 to match the changes in MimeKit.
- Capture the Socket timeout value in Read/WriteAsync() to have it in case of exceptions. (issue #1327)
.NET Framework 4.5.2
- System.Threading.Tasks.Extensions (>= 4.5.4)
- MimeKit (>= 3.2.0)
.NET Framework 4.6.1
- System.Threading.Tasks.Extensions (>= 4.5.4)
- MimeKit (>= 3.2.0)
.NET Framework 4.7
- System.Threading.Tasks.Extensions (>= 4.5.4)
- MimeKit (>= 3.2.0)
.NET Framework 4.8
- System.Threading.Tasks.Extensions (>= 4.5.4)
- MimeKit (>= 3.2.0)
.NET 5.0
- MimeKit (>= 3.2.0)
.NET 6.0
- MimeKit (>= 3.2.0)
.NET Standard 2.0
- System.Threading.Tasks.Extensions (>= 4.5.4)
- MimeKit (>= 3.2.0)
.NET Standard 2.1
- MimeKit (>= 3.2.0)
| Version | Downloads | Last updated |
|---|---|---|
| 4.14.1 | 3 | 01/21/2026 |
| 4.14.0 | 3 | 01/20/2026 |
| 4.13.0 | 3 | 01/20/2026 |
| 4.12.1 | 3 | 01/20/2026 |
| 4.12.0 | 3 | 01/20/2026 |
| 4.11.0 | 5 | 01/16/2026 |
| 4.10.0 | 3 | 01/20/2026 |
| 4.9.0 | 3 | 01/21/2026 |
| 4.8.0 | 3 | 01/21/2026 |
| 4.7.1.1 | 2 | 01/20/2026 |
| 4.7.1 | 3 | 01/21/2026 |
| 4.7.0 | 3 | 01/21/2026 |
| 4.6.0 | 3 | 01/21/2026 |
| 4.5.0 | 3 | 01/21/2026 |
| 4.4.0 | 3 | 01/21/2026 |
| 4.3.0 | 2 | 01/21/2026 |
| 4.2.0 | 2 | 01/21/2026 |
| 4.1.0 | 3 | 01/21/2026 |
| 4.0.0 | 3 | 01/21/2026 |
| 3.6.0 | 3 | 01/21/2026 |
| 3.5.0 | 3 | 01/21/2026 |
| 3.4.3 | 2 | 01/21/2026 |
| 3.4.2 | 2 | 01/21/2026 |
| 3.4.1 | 3 | 01/21/2026 |
| 3.4.0 | 2 | 01/21/2026 |
| 3.3.0 | 2 | 01/21/2026 |
| 3.2.0 | 2 | 01/21/2026 |
| 3.1.1 | 3 | 01/21/2026 |
| 3.1.0 | 3 | 01/21/2026 |
| 3.0.0 | 3 | 01/21/2026 |
| 2.15.0 | 3 | 01/20/2026 |
| 2.14.0 | 3 | 01/20/2026 |
| 2.13.0 | 3 | 01/20/2026 |
| 2.12.0 | 3 | 01/20/2026 |
| 2.11.1 | 3 | 01/21/2026 |
| 2.11.0 | 3 | 01/20/2026 |
| 2.10.1 | 3 | 01/20/2026 |
| 2.10.0 | 3 | 01/20/2026 |
| 2.9.0 | 3 | 01/21/2026 |
| 2.8.0 | 3 | 01/21/2026 |
| 2.7.0 | 2 | 01/21/2026 |
| 2.6.0 | 3 | 01/21/2026 |
| 2.5.2 | 2 | 01/21/2026 |
| 2.5.1 | 3 | 01/21/2026 |
| 2.5.0 | 3 | 01/21/2026 |
| 2.4.1 | 2 | 01/21/2026 |
| 2.4.0.1 | 3 | 01/20/2026 |
| 2.4.0 | 2 | 01/21/2026 |
| 2.3.2 | 2 | 01/21/2026 |
| 2.3.1.6 | 3 | 01/20/2026 |
| 2.3.1 | 2 | 01/21/2026 |
| 2.3.0 | 2 | 01/21/2026 |
| 2.2.0 | 3 | 01/21/2026 |
| 2.1.5.1 | 3 | 01/20/2026 |
| 2.1.4 | 2 | 01/21/2026 |
| 2.1.3 | 2 | 01/21/2026 |
| 2.1.2 | 2 | 01/21/2026 |
| 2.1.1 | 3 | 01/21/2026 |
| 2.1.0.3 | 3 | 01/20/2026 |
| 2.0.7 | 2 | 01/21/2026 |
| 2.0.6 | 2 | 01/21/2026 |
| 2.0.5 | 3 | 01/21/2026 |
| 2.0.4 | 2 | 01/21/2026 |
| 2.0.3 | 2 | 01/21/2026 |
| 2.0.2 | 3 | 01/21/2026 |
| 2.0.1 | 3 | 01/21/2026 |
| 2.0.0 | 2 | 01/21/2026 |
| 1.22.0 | 3 | 01/20/2026 |
| 1.20.0 | 2 | 01/20/2026 |
| 1.18.1.1 | 2 | 01/20/2026 |
| 1.18.1 | 2 | 01/21/2026 |
| 1.18.0 | 2 | 01/20/2026 |
| 1.16.2 | 3 | 01/20/2026 |
| 1.16.1 | 2 | 01/21/2026 |
| 1.16.0 | 2 | 01/20/2026 |
| 1.14.2 | 3 | 01/20/2026 |
| 1.12.0 | 2 | 01/20/2026 |
| 1.10.2 | 3 | 01/20/2026 |
| 1.10.1 | 2 | 01/21/2026 |
| 1.10.0 | 2 | 01/21/2026 |