* Support SMTP commands: HELO, MAIL FROM, RCPT TO, DATA, QUIT. * Support ESMTP commands: EHLO, AUTH LOGIN, AUTH NTLM, AUTH CRAM-MD5. * Support Normal recipient, carbon copy recipient and blind carbon copy recipient. * DNS lookup to send email without specified SMTP server. * Test validity of email address. * Support asynchronous mode and event driving. * Support Text/Html/Alternative body. * Support multiple attachments and embedded pictures. * Import text/html to email body from specified file/URL. * Add customized headers in email. * Save email as specified file. * Load email file for sending. * Mail Queuing with EASendMail Service. * Support Socks4/Socks5/Http proxy connection. * DomainKeys and DKIM signature. * Exchange Web Service and WebDAV. * Gmail SMTP OAUTH/XOAUTH 2.0. * Protocol: SSL v2, SSL v3, TLS v1 * Key Algorithms: RSA, DH * ESMTP command: STARTTLS * Signed and Encrypted Message with digital certificate * Signing Algorithms: rsa-sha1, CRAM-MD5, rsa-sha256 * Encryption Algorithms: RC2, RC4, DES, 3DES, AES * Send email in background. * Support mulitple threadings. * Replace variables in email body text. * Select recipients from database. * Send email in schedule. * Provide failure delivery-report. * Supports .NET Compact Framework 2.0/3.5 * .NET Framework: Separate builds for .NET 1.1, 2.0, 3.5, 4.0, 4.5 * ActiveX/COM: Separate builds for 32bit/x64

* High Level API, No DOM Hacking: Using the InboxSDK means no more lost time hacking Gmail's DOM. No more finding intricate selectors to insert your own UI. No more testing every configuration of Gmail to make sure everything still works. No more guessing how the compose area will appear. No more late nights when Gmail slightly changes their DOM. Instead, with InboxSDK, you interact with simple high level classes like ComposeView. You call straightforward methods (like adding buttons or getting the subject) on the class and the SDK abstracts the entire DOM away from you. * Maintained Day In & Day Out: The InboxSDK is designed with a changing Gmail in mind. The SDK is remote loaded, always up to date with the latest version of Gmail, and updated frequently with new features. * It provides all of the necessary APIs to create full-fledged applications directly inside Gmail and Inbox.