1/*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) Daniel Stenberg, <daniel@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.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 * SPDX-License-Identifier: curl 22 * 23 ***************************************************************************/ 24 25/* <DESC> 26 * Verify an SMTP email address 27 * </DESC> 28 */ 29 30#include <stdio.h> 31#include <string.h> 32#include <curl/curl.h> 33 34/* This is a simple example showing how to verify an email address from an 35 * SMTP server. 36 * 37 * Notes: 38 * 39 * 1) This example requires libcurl 7.34.0 or above. 40 * 2) Not all email servers support this command and even if your email server 41 * does support it, it may respond with a 252 response code even though the 42 * address does not exist. 43 */ 44 45int main(void) 46{ 47 CURL *curl; 48 CURLcode res; 49 struct curl_slist *recipients = NULL; 50 51 curl = curl_easy_init(); 52 if(curl) { 53 /* This is the URL for your mailserver */ 54 curl_easy_setopt(curl, CURLOPT_URL, "smtp://mail.example.com"); 55 56 /* Note that the CURLOPT_MAIL_RCPT takes a list, not a char array */ 57 recipients = curl_slist_append(recipients, "<recipient@example.com>"); 58 curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients); 59 60 /* Perform the VRFY */ 61 res = curl_easy_perform(curl); 62 63 /* Check for errors */ 64 if(res != CURLE_OK) 65 fprintf(stderr, "curl_easy_perform() failed: %s\n", 66 curl_easy_strerror(res)); 67 68 /* Free the list of recipients */ 69 curl_slist_free_all(recipients); 70 71 /* curl will not send the QUIT command until you call cleanup, so you 72 * should be able to reuse this connection for additional requests. It may 73 * not be a good idea to keep the connection open for a long time though 74 * (more than a few minutes may result in the server timing out the 75 * connection) and you do want to clean up in the end. 76 */ 77 curl_easy_cleanup(curl); 78 } 79 80 return 0; 81} 82