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.
email, e-mail, smtp, pop, pop3, mime, RFC 821, RFC 1725, RFC 822, RFC 1341,

 2)   CSSMTP V01.6b
Command Line SMTP Client includes - esmtp authentication, automatic file type detection, automatic 7bit, quoted-printable and base64 encoding - multiple attachments - multiple recipients.
smtp, command line, RFC 821,