MailBee.NET SMTP
MailBee.NET SMTP enables .NET applications to compose, mail merge, send mail to SMTP server (including Gmail and MS Exchange), submit to IIS queue, or send via DNS MX lookup. Supports SSL, proxy servers, HTML with embedded pictures, send web page, DomainKeys/DKIM signatures, charsets, authentication (including NTLM and GSSAPI), attachments, custom headers, mail merge over database, read/delivery receipt, XML, streams. Royalty-free distribution.