1)   CSMail Developer Edition 6.0.0.9789
Active X Email Components - SMTP (RFC 821), POP3 (RFC 1725) and MIME (RFC 1341) objects. BUILT IN SMTP/POP3/SOCKS PROXY SUPPORT, ESMTP AUTHENTICATION, STANDARD MIME ENCODING/DECODING,SMTP ENVELOPE, FULL SUPPORT FOR MULTIPART MESSAGES.

 2)   Aspose.Network for .NET 3.2.0.0
Aspose.Network is a suite of .NET components for professional network programming that supports .NET logging framework, Sending a Batch of Emails and all the useful features of SMTP, MIME, POP3, FTP, WhoIs, DNS, ICMP,IMAP, HTTP,SOCKS 4/4A & SOCKS 5.