OpaqueMail (nuget): .NET email library with full support for IMAP, POP3, and SMTP.  Supports S/MIME and PGP message signing, encryption, and decryption to foster better email 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.  Features patterns similar to System.Net.Mail.MailMessage and System.Net.Mail.SmtpClient for simplified upgrades of existing code.  Implements .NET 4.5 async and await.  Thoroughly documented.  Optimized for security, usability, 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 (https://bertjohnson.com/) of Allcloud Inc. (https://allcloud.com/).
Keywords: email|smime|smtp|imap|pop3|encryption|security|c-sharp|pgp