On Fri, 30 Sep 2016, Canellas wrote:

> Searching the web, I came to conclude that either I go deep into RFC 2045,
> or try to use another library.

That seems accurate. libcurl only handles the email *transport*: sending the
SMTP protocol stuff and the payload as *prepared by you*. You need to pass on
the correct email headers and body. To send binary files you need to send a
mime-formatted email body. libcurl will not help you produce such email body.
You need to find a tool/library that makes one.

A quick google showed me at least these library candidates (I've not used any
of them myself):

  - libcmime - http://libcmime.org/
  - gmime - http://spruce.sourceforge.net/gmime/
  - mimetic - http://www.codesink.org/mimetic_mime_library.html (C++)

-- 
  / daniel.haxx.se
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