1 /*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel (at) haxx.se>, et al. 9 * 10 * This software is licensed as described in the file COPYING, which 11 * you should have received as part of this distribution. The terms 12 * are also available at https://curl.haxx.se/docs/copyright.html. 13 * 14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell 15 * copies of the Software, and permit persons to whom the Software is 16 * furnished to do so, under the terms of the COPYING file. 17 * 18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY 19 * KIND, either express or implied. 20 * 21 ***************************************************************************/ 22 23 /* <DESC> 24 * SMTP example showing how to verify an e-mail address 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 verify an e-mail address from an 33 * SMTP server. 34 * 35 * Notes: 36 * 37 * 1) This example requires libcurl 7.34.0 or above. 38 * 2) Not all email servers support this command and even if your email server 39 * does support it, it may respond with a 252 response code even though the 40 * address doesn't exist. 41 */ 42 43 int main(void) 44 { 45 CURL *curl; 46 CURLcode res; 47 struct curl_slist *recipients = NULL; 48 49 curl = curl_easy_init(); 50 if(curl) { 51 /* This is the URL for your mailserver */ 52 curl_easy_setopt(curl, CURLOPT_URL, "smtp://mail.example.com"); 53 54 /* Note that the CURLOPT_MAIL_RCPT takes a list, not a char array */ 55 recipients = curl_slist_append(recipients, "<recipient (at) example.com>"); 56 curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients); 57 58 /* Perform the VRFY */ 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 } 80
