CURL

#include <stdio.h>
#include <string.h>
#include <curl/curl.h>

int main(void)
{
    CURL* curl;
    CURLcode res = CURLE_OK;

    curl = curl_easy_init();
    if (curl) {
        struct curl_slist* recipients = NULL;
        curl_mime* mime;
        curl_mimepart* part;
        const char** cpp;

        curl_easy_setopt(curl, CURLOPT_URL, "smtps://smtp.gmail.com:465");
        curl_easy_setopt(curl, CURLOPT_USERNAME, "tvoje.ime@gmail.com");
        curl_easy_setopt(curl, CURLOPT_PASSWORD, "TvojaSifra");
        recipients = curl_slist_append(recipients, "ime.primalac@gmail.com");
        curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);

        mime = curl_mime_init(curl);
        part = curl_mime_addpart(mime);
        curl_mime_filedata(part, "Ime (adresa) fajla za slanje");
        curl_easy_setopt(curl, CURLOPT_MIMEPOST, mime);

        res = curl_easy_perform(curl);

        if (res != CURLE_OK)
            fprintf(stderr, "Nije poslato, error: %s\n", curl_easy_strerror(res));

        curl_slist_free_all(recipients);
        curl_easy_cleanup(curl);
        curl_mime_free(mime);
    }

    return (int)res;
}