HS SMTP is a software library in C (supplied with full
source code) which implements the client side of
Simple Mail Transfer Protocol (SMTP) over TCP socket
layer according to RFC 821. Support for transfer of
basic message header and text is provided

From version 1.1, HS SMTP supports ESMTP extension for
LOGIN Authentication using Base64 encoding and message
sending to multiple recipients from address list.

From version 1.2 HS SMTP supports sending binary file
attachments using MIME version 1.0 base64 encoding

From version 2.0.0 HS SMTP supports secure SMTP over
TLS / SSL (RFC 3207)

To send a text email message to any address on the
internet, the user application calls a single function
HsSmtpSendMail, specifying mail server name or IP
address, sender address, recipient address, message
text buffer and length, subject, cc and an event

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