using (var imap = new Rebex.Net.Imap())
{
  // connect and login to Gmail IMAP server
  imap.Connect("imap.gmail.com", SslMode.Implicit);
  imap.Login(username, password);

  // get list of new messages in Inbox
  imap.SelectFolder("Inbox");
  var list = imap.Search(ImapSearchParameter.Unread);

  // print subjects of those messages
  foreach (var info in list)
  {
    Console.WriteLine(info.Subject);
  }
}

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Mail library for C# and VB.NET developers. Provides all you need for sending, receiving, encrypting, decrypting, signing, verifying, loading, saving and processing e-mails messages.

Includes:

• IMAP client
• POP3 client
• EWS (Exchange Web Services) client
• SMTP client
• MIME and S/MIME API

Connect, log in, search for new messages, download messages, disconnect. Send email with attachments. It's easy to start developing with our library. Simple code for common use cases.

Send a message using a single line of code. TLS/SSL support. Direct sending to recipient's SMTP server.

Upload and download messages using IMAP protocol. TLS/SSL support. Work with email folders. Multiple message operations - copy, delete, or set flags for a range of messages in a single operation. Search for messages with specific attributes.

Supports message encryption and decryption. Supports signing and signature validation. Based on X.509 certificates and Cryptographic Message Syntax.

Use RSASSA-PSS signatures and RSAES-OAEP encryption with SHA-1, SHA-256, SHA-384 or SHA-512 on all supported platforms including .NET Framework 2.0 and .NET Compact Framework.

Upload and download messages using Exchange Web Services. TLS/SSL support. Work with email folders. Multiple message operations - copy, delete, or set flags for a range of messages in a single operation. Search for messages with specific attributes. Send emails using EWS.

Retrieve messages using a simple POP3 protocol. TLS/SSL support. Retrieve message lists with size, sequence number, unique ID or headers.

Keep your passwords and data secure. Using TLS/SSL to encrypt communication is as simple as it gets.

Supported features include:

Basic username/password authentication is often not good enough. That's why we support additional authentication methods such as NTLM, Kerberos (with single sign-on as well) or client certificate authentication.

• .NET Framework
  2.0, 3.0, 3.5. 4.0, 4.5.x, 4.6.x, 4.7.x (32-bit and 64-bit) on Windows
• .NET Core
  1.1, 2.0, 2.1, 2.2 (32-bit or 64-bit) on Windows, Linux and macOS
• .NET Compact Framework
  3.5, 3.9 on Windows Mobile, Windows CE, Pocket PC, Windows Embedded Compact 7, Windows Embedded Compact 2013
• Mono
  4.x, 5.x on Linux and Apple macOS (OS X)
• Xamarin.iOS
  Xamarin.iOS 10.3 or later
• Xamarin.Android
  Xamarin.Android 8.0 or later

Supports Visual Studio 2008, 2010, 2012, 2013, 2015 and 2017, Visual Studio for Mac.

Supports .NET Standard on .NET Core.

Experimental support for Universal Windows Platform on Windows 10 and Windows 10 IoT.

Experimental support for Xamarin.Mac 3.8 and higher.

Learn more about supported standards and platforms.

Thousands of developers chose Rebex Secure Mail for adding SMTP, IMAP, POP3, MIME or S/MIME capabilities to their applications.

Rebex Secure Mail is a mature and stable component maintained since 2006. We have been adding new features year after year, inspired by user feedback. For example:

• Task-based Asynchronous API (.NET 4 or later)
• Automated (or custom) certificate validation
• Sending raw POP3/SMTP/IMAP commands
• Sending email on behalf of another user
• Logging all communication with the server
• Ability to use Secure Mail in SSIS, SQL CLR and PowerShell
• FIPS 140-2 compliant mode

And many, many more...