OpaqueMail 1.6.6

.NET e-mail library with full support for IMAP, POP3, and SMTP. Provides S/MIME message signing, encryption, and decryption to foster better e-mail security and privacy.

Follows IETF standards, implementing all IMAP4rev1, POP3, SMTP, and S/MIME 3.2 commands plus common extensions such as IDLE. Supports MIME, Unicode, and TNEF encoding.

Includes a fully-featured test client that allows browsing and searching of IMAP and POP3 messages as well as sending of SMTP messages with encryption. Automatically embeds images into Text/HTML messages and strips Script tags.

Inherits from System.Net.Mail.MailMessage and System.Net.Mail.SmtpClient for simplified upgrades of existing code. Implements .NET 4.5 async and await.

Thoroughly documented. Designed for security, portability, and performance.

Supporting documentation and tutorials available at (http://opaquemail.org/library/).

Licensed according to the MIT License (http://mit-license.org/).

Created by Bert Johnson (http://bertjohnson.net/) of Bkip Inc. (http://bkip.com/).

There is a newer version of this package available.
See the version list below for details.
Install-Package OpaqueMail -Version 1.6.6
dotnet add package OpaqueMail --version 1.6.6
<PackageReference Include="OpaqueMail" Version="1.6.6" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add OpaqueMail --version 1.6.6
The NuGet Team does not provide support for this client. Please contact its maintainers for support.

Release Notes

Version 1.6.6 improves IMAP IDLE handling and fixes bugs related to email address and charset parsing.


This package has no dependencies.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version History

Version Downloads Last updated
2.4.3 16,143 1/10/2017
2.4.1 526 12/23/2016
2.2.4 2,922 11/27/2015
1.6.6 23,510 2/2/2014