curl / libcurl / API / Examples / smtp-expn.c

smtp-expn.c

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/***************************************************************************
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 *
 * Copyright (C) 1998 - 2015, 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.haxx.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 expand an e-mail mailing list
 * </DESC>
 */ 
 
#include <stdio.h>
#include <string.h>
#include <curl/curl.h>
 
/* This is a simple example showing how to expand an e-mail mailing list.
 *
 * Notes:
 *
 * 1) This example requires libcurl 7.34.0 or above.
 * 2) Not all email servers support this command.
 */ 
 
int main(void)
{
  CURL *curl;
  CURLcode res;
  struct curl_slist *recipients = NULL;
 
  curl = curl_easy_init();
  if(curl) {
    /* This is the URL for your mailserver */ 
    curl_easy_setopt(curl, CURLOPT_URL, "smtp://mail.example.com");
 
    /* Note that the CURLOPT_MAIL_RCPT takes a list, not a char array  */ 
    recipients = curl_slist_append(recipients, "Friends");
    curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
 
    /* Set the EXPN command */ 
    curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "EXPN");
 
    /* Perform the custom request */ 
    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 the list of recipients */ 
    curl_slist_free_all(recipients);
 
    /* Curl won't send the QUIT command until you call cleanup, so you should
     * be able to re-use this connection for additional requests. 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);
  }
 
  return 0;
}