Comprehensive E-Mail Components for .NET
E-mail components seamlessly combine security, efficiency, and ease of use so you can quickly develop custom e-mail handling applications. Includes classes for creating, sending and receiving email. C# and VB code snippets and sample applications will give your project a boost. Try our on-line WebMail app for a quick demo!
Manage email using standards-based protocols
Simple Mail Transfer Protocol (SMTP) and Post Office Protocol (POP3) components send and receive email, respectively
Internet Message Access Protocol (IMAP4) component manages email on IMAP4 servers (Gmail, Yahoo, Exchange, etc.)
Multipurpose Internet Mail Extensions (MIME) enable the encoding and decoding of non-ASCII data like international UNICODE text and binary data
Secure/Multipurpose Internet Mail Extensions (S/MIME) version 3.0, 3.1, 3.2 enable message signing (authentication) and encryption (privacy)
more ... 

Integrated security protects data at 3 levels
Level 1: comprehensive login options authenticate the client to the server (APOP, CRAM-MD5, LOGIN, PLAIN, GSSAPI, NTLM, XOAUTH2 (OAuth 2.0), clear-text, AUTO)
Level 2: SSL2, SSL3, PCT, TLS 1.0, 1.1, 1.2 implements end-to-end encryption between your application and the email server
Level 3: S/MIME encoding/decoding authenticates the integrity and author of the message and encrypts the content
Included X509 certificate management support is used to manage security at levels 2 and 3

Ease-of-Use, Efficiency, Stability
Create HTML mail (MHTML) from HTML documents with one line of code
MailMessage class provides a nested hierarchy of MIME entities (parts) you can easily manipulate:
Properties expose header labels and enumerate multipart content
Author email of any complexity
IsMime property to control the use of MIME encoding on a per message basis.
Included MessageEditor control (with source code) provides a message viewer/editor
MailMessage.GetEncodingStream() returns a Stream that decodes when Write() is called (the MailMessage is incrementally populated with decoded content) and encodes when Read() is called (the user's buffer is filled with the next segment of the encoded MailMessage)
Suitable for advanced WinForms applications as well as single-threaded services, console and web applications
Winform samples demonstrate robust multi-threading features and Task-based Asynchronous Pattern (TAP)
.NET-centric, reusing classes from System.Net.Mail and System.Net.Mime

 
Interoperability
Gmail, Yahoo! mail, Microsoft Exchange fully supported
Complete internationalization support for non-ASCII character sets (Kanji, Korean, Chinese, Arabic, etc.)
Compatible with FIPS 140-2 standards
Complies with email RFCs for SMTP (2821, 2822, 3461), POP3 (1939, 2449), IMAP4 (3501), MIME (2045, 2046, 2047, 6532), S/MIME (2633, 3851, 5751)