...

/***************************************************************************
 * _ _ ____ _
 * Project ___| | | | _ \| |
 * / __| | | | |_) | |
 * | (__| |_| | _ <| |___
 * \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
 *
 * This software is licensed as described in the file COPYING, which
 * you should have received as part of this distribution. The terms
 * are also available at https://curl.se/docs/copyright.html.
 *
 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
 * copies of the Software, and permit persons to whom the Software is
 * furnished to do so, under the terms of the COPYING file.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ***************************************************************************/

/* <DESC>
 * SMTP example showing how to send mime e-mails
 * </DESC>
 */

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

/* This is a simple example showing how to send mime mail using libcurl's SMTP
 * capabilities. For an example of using the multi interface please see
 * smtp-multi.c.
 *
 * Note that this example requires libcurl 7.56.0 or above.
 */

#define FROM "<sender@example.org>"
#define TO "<addressee@example.net>"
#define CC "<info@example.org>"

static const char *headers_text[] = {
 "Date: Tue, 22 Aug 2017 14:08:43 +0100",
 "To: " TO,
 "From: " FROM " (Example User)",
 "Cc: " CC " (Another example User)",
 "Message-ID: <dcd7cb36-11db-487a-9f3a-e652a9458efd@"
 "rfcpedant.example.org>",
 "Subject: example sending a MIME-formatted message",
 NULL
};

static const char inline_text[] =
  "This is the inline text message of the e-mail.\r\n"
  "\r\n"
  "  It could be a lot of lines that would be displayed in an e-mail\r\n"
  "viewer that is not able to handle HTML.\r\n";

static const char inline_html[] =
 "<html><body>\r\n"
 "This is the inline HTML message of the e-mail."
 " \r\n"
 "It could be a lot of HTML data that would be displayed by "
 "e-mail viewers able to handle HTML."
 "</body></html>\r\n";

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

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

/* This is the URL for your mailserver */
    curl_easy_setopt(curl, CURLOPT_URL, "smtp://mail.example.com");

/* Note that this option isn't strictly required, omitting it will result
     * in libcurl sending the MAIL FROM command with empty sender data. All
     * autoresponses should have an empty reverse-path, and should be directed
     * to the address in the reverse-path which triggered them. Otherwise,
     * they could cause an endless loop. See RFC 5321 Section 4.5.5 for more
     * details.
     */
    curl_easy_setopt(curl, CURLOPT_MAIL_FROM, FROM);

/* Add two recipients, in this particular case they correspond to the
     * To: and Cc: addressees in the header, but they could be any kind of
     * recipient. */
    recipients = curl_slist_append(recipients, TO);
    recipients = curl_slist_append(recipients, CC);
    curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);

/* Build and set the message header list. */
    for(cpp = headers_text; *cpp; cpp++)
      headers = curl_slist_append(headers, *cpp);
    curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);

/* Build the mime message. */
    mime = curl_mime_init(curl);

/* The inline part is an alternative proposing the html and the text
       versions of the e-mail. */
    alt = curl_mime_init(curl);

/* HTML message. */
    part = curl_mime_addpart(alt);
    curl_mime_data(part, inline_html, CURL_ZERO_TERMINATED);
    curl_mime_type(part, "text/html");

/* Text message. */
    part = curl_mime_addpart(alt);
    curl_mime_data(part, inline_text, CURL_ZERO_TERMINATED);

/* Create the inline part. */
    part = curl_mime_addpart(mime);
    curl_mime_subparts(part, alt);
    curl_mime_type(part, "multipart/alternative");
    slist = curl_slist_append(NULL, "Content-Disposition: inline");
    curl_mime_headers(part, slist, 1);

/* Add the current source program as an attachment. */
    part = curl_mime_addpart(mime);
    curl_mime_filedata(part, "smtp-mime.c");
    curl_easy_setopt(curl, CURLOPT_MIMEPOST, mime);

/* Send the message */
    res = curl_easy_perform(curl);

/* Check for errors */
    if(res != CURLE_OK)
      fprintf(stderr, "curl_easy_perform() failed: %s\n",
              curl_easy_strerror(res));

/* Free lists. */
    curl_slist_free_all(recipients);
    curl_slist_free_all(headers);

/* curl won't send the QUIT command until you call cleanup, so you should
     * be able to re-use this connection for additional messages (setting
     * CURLOPT_MAIL_FROM and CURLOPT_MAIL_RCPT as required, and calling
     * curl_easy_perform() again. It may not be a good idea to keep the
     * connection open for a very long time though (more than a few minutes
     * may result in the server timing out the connection), and you do want to
     * clean up in the end.
     */
    curl_easy_cleanup(curl);

/* Free multipart message. */
    curl_mime_free(mime);
  }

return (int)res;
}

.	Edit
..	Edit
10-at-a-time.c	Edit
ABI.md	Edit
CONTRIBUTE.md	Edit
INTERNALS.md	Edit
Makefile.example	Edit
altsvc.c	Edit
anyauthput.c	Edit
cacertinmem.c	Edit
certinfo.c	Edit
chkspeed.c	Edit
cookie_interface.c	Edit
crawler.c	Edit
curlgtk.c	Edit
curlx.c	Edit
debug.c	Edit
ephiperfifo.c	Edit
evhiperfifo.c	Edit
externalsocket.c	Edit
fileupload.c	Edit
fopen.c	Edit
ftp-wildcard.c	Edit
ftpget.c	Edit
ftpgetinfo.c	Edit
ftpgetresp.c	Edit
ftpsget.c	Edit
ftpupload.c	Edit
ftpuploadfrommem.c	Edit
ftpuploadresume.c	Edit
getinfo.c	Edit
getinmemory.c	Edit
getredirect.c	Edit
getreferrer.c	Edit
ghiper.c	Edit
hiperfifo.c	Edit
href_extractor.c	Edit
htmltidy.c	Edit
http-post.c	Edit
http2-download.c	Edit
http2-pushinmemory.c	Edit
http2-serverpush.c	Edit
http2-upload.c	Edit
http3-present.c	Edit
http3.c	Edit
httpcustomheader.c	Edit
httpput-postfields.c	Edit
httpput.c	Edit
https.c	Edit
imap-append.c	Edit
imap-authzid.c	Edit
imap-copy.c	Edit
imap-create.c	Edit
imap-delete.c	Edit
imap-examine.c	Edit
imap-fetch.c	Edit
imap-list.c	Edit
imap-lsub.c	Edit
imap-multi.c	Edit
imap-noop.c	Edit
imap-search.c	Edit
imap-ssl.c	Edit
imap-store.c	Edit
imap-tls.c	Edit
multi-app.c	Edit
multi-debugcallback.c	Edit
multi-double.c	Edit
multi-event.c	Edit
multi-formadd.c	Edit
multi-poll.c	Edit
multi-post.c	Edit
multi-single.c	Edit
multi-uv.c	Edit
multithread.c	Edit
opensslthreadlock.c	Edit
parseurl.c	Edit
persistent.c	Edit
pop3-authzid.c	Edit
pop3-dele.c	Edit
pop3-list.c	Edit
pop3-multi.c	Edit
pop3-noop.c	Edit
pop3-retr.c	Edit
pop3-ssl.c	Edit
pop3-stat.c	Edit
pop3-tls.c	Edit
pop3-top.c	Edit
pop3-uidl.c	Edit
post-callback.c	Edit
postinmemory.c	Edit
postit2-formadd.c	Edit
postit2.c	Edit
progressfunc.c	Edit
resolve.c	Edit
rtsp.c	Edit
sampleconv.c	Edit
sendrecv.c	Edit
sepheaders.c	Edit
sessioninfo.c	Edit
sftpget.c	Edit
sftpuploadresume.c	Edit
shared-connection-cache.c	Edit
simple.c	Edit
simplepost.c	Edit
simplessl.c	Edit
smooth-gtk-thread.c	Edit
smtp-authzid.c	Edit
smtp-expn.c	Edit
smtp-mail.c	Edit
smtp-mime.c	Edit
smtp-multi.c	Edit
smtp-ssl.c	Edit
smtp-tls.c	Edit
smtp-vrfy.c	Edit
sslbackend.c	Edit
synctime.c	Edit
threaded-ssl.c	Edit
url2file.c	Edit
urlapi.c	Edit
usercertinmem.c	Edit
xmlstream.c	Edit