examples: Added SMTP email verification example

diff --git a/docs/examples/smtp-vrfy.c b/docs/examples/smtp-vrfy.c
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+++ b/docs/examples/smtp-vrfy.c
@@ -0,0 +1,74 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2013, 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 http://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.
+ *
+ ***************************************************************************/
+#include <stdio.h>
+#include <string.h>
+#include <curl/curl.h>
+
+/* This is a simple example showing how to verify an email address from an
+ * SMTP server.
+ *
+ * Notes:
+ *
+ * 1) That this example requires libcurl v7.34.0 or above.
+ * 2) Not all email servers support this command and even if your email server
+ *    does support it, it may respond with a 252 response code even though the
+ *    address doesn't exist.
+ */
+
+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 - you can also use an smtps:// URL
+     * here */
+    curl_easy_setopt(curl, CURLOPT_URL, "smtp://mail.example.net");
+
+    /* Note that the CURLOPT_MAIL_RCPT takes a list, not a char array  */
+    recipients = curl_slist_append(recipients, "<recipient@example.com>");
+    curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
+
+    /* Perform the VRFY */
+    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;
+}