A high-performance .NET library for creating and parsing MIME messages with support for S/MIME, PGP, DKIM, TNEF, and Unix mbox.
MimeKit is a .NET library for creating, parsing, and manipulating MIME messages, which are the standard format for emails and multipart internet content. It solves the problem of broken or non-compliant MIME implementations in email software by providing a robust, specification-adherent parser with high performance and support for modern security protocols like S/MIME and PGP.
.NET developers building email clients, servers, or applications that need to generate, parse, or secure email messages. It is also suitable for developers working on email authentication (DKIM/ARC), encryption, or batch processing of mbox files.
Developers choose MimeKit for its exceptional performance—often 25x faster than alternatives—and its comprehensive feature set including S/MIME, PGP, DKIM, and ARC support. Its strict adherence to MIME standards and easy-to-use API make it the most reliable choice for email processing in .NET.
A .NET MIME creation and parser library with support for S/MIME, PGP, DKIM, TNEF and Unix mbox spools.
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Benchmarks show MimeKit is 25x faster than OpenPOP.NET and matches native C parsers like GMime, ideal for high-volume email processing.
Supports S/MIME encryption, PGP/MIME, DKIM signing, and ARC verification, covering modern email authentication and encryption needs in one library.
Offers BodyBuilder for easy message creation and MimeIterator for navigating complex MIME trees, reducing boilerplate code despite MIME complexity.
Builds on .NET Framework, .NET Standard, and .NET 6 with CI/CD on Linux, Mac, and Windows, ensuring broad deployment options.
Implementing S/MIME requires custom database integration, and PGP support needs subclassing GnuPGContext with password callbacks, adding initial development time.
Correctly traversing MIME tree structures and handling parts like multipart/related demands a solid understanding of email specifications, despite provided utilities.
As a C# library, MimeKit is confined to .NET projects, making it unsuitable for polyglot environments or non-.NET applications.