ActiveEmail SMTP E-mail Toolkit 

ActiveEmail provides an easy-to-use programming interface to SMTP e-mail and NNTP news communications; Use it to send messages automatically, or in batches, from applications, web servers, or from the command-line.
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CliMail 

CliMail is a set of command line utilities designed to send and receive email. Send plain-text or HTML (with embedded pictures) email with attachments using to, bcc, and cc recipients. List, display or delete email from POP3(S) or IMAP(S) mailboxes
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CSMail Developer Edition 

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.
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