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    8:  * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
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   10:  * This software is licensed as described in the file COPYING, which
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   22: 
   23: /* <DESC>
   24:  * SMTP example showing how to expand an e-mail mailing list
   25:  * </DESC>
   26:  */
   27: 
   28: #include <stdio.h>
   29: #include <string.h>
   30: #include <curl/curl.h>
   31: 
   32: /* This is a simple example showing how to expand an e-mail mailing list.
   33:  *
   34:  * Notes:
   35:  *
   36:  * 1) This example requires libcurl 7.34.0 or above.
   37:  * 2) Not all email servers support this command.
   38:  */
   39: 
   40: int main(void)
   41: {
   42:   CURL *curl;
   43:   CURLcode res;
   44:   struct curl_slist *recipients = NULL;
   45: 
   46:   curl = curl_easy_init();
   47:   if(curl) {
   48:     /* This is the URL for your mailserver */
   49:     curl_easy_setopt(curl, CURLOPT_URL, "smtp://mail.example.com");
   50: 
   51:     /* Note that the CURLOPT_MAIL_RCPT takes a list, not a char array  */
   52:     recipients = curl_slist_append(recipients, "Friends");
   53:     curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
   54: 
   55:     /* Set the EXPN command */
   56:     curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "EXPN");
   57: 
   58:     /* Perform the custom request */
   59:     res = curl_easy_perform(curl);
   60: 
   61:     /* Check for errors */
   62:     if(res != CURLE_OK)
   63:       fprintf(stderr, "curl_easy_perform() failed: %s\n",
   64:               curl_easy_strerror(res));
   65: 
   66:     /* Free the list of recipients */
   67:     curl_slist_free_all(recipients);
   68: 
   69:     /* Curl won't send the QUIT command until you call cleanup, so you should
   70:      * be able to re-use this connection for additional requests. It may not be
   71:      * a good idea to keep the connection open for a very long time though
   72:      * (more than a few minutes may result in the server timing out the
   73:      * connection) and you do want to clean up in the end.
   74:      */
   75:     curl_easy_cleanup(curl);
   76:   }
   77: 
   78:   return 0;
   79: }