* 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

QuickEmailVerification is a cross platform Software As A Service offering, Bulk Email Verification Single Email Verification API Email Verification JavaScript Widget Bulk Email Verification API Single Email Verification Tool Email Service Provider Integration API libraries in languages like PHP, Phyton, Ruby etc. Check out more detail on http://docs.quickemailverification.com/