examples: Removed user information and TLS setup from SMTP multi example

Simplified the SMTP multi example as this example should demonstrate
the differences the easy and multi interfaces rather than introduce new
concepts such as user authentication and TLS which are shown in the TLS
and SSL examples.

docs/examples/smtp-multi.c

@@ -23,17 +23,12 @@
 #include <curl/curl.h>
 
 /* This is an example showing how to send mail using libcurl's SMTP
- * capabilities via the multi interface.
+ * capabilities. It builds on the smtp-mail.c example to demonstrate how to use
+ * libcurl's multi interface.
  *
  * Note that this example requires libcurl 7.20.0 or above.
  */
 
-/*
- * This is the list of basic details you need to tweak to get things right.
- */
-#define SERVER   "smtp.example.com"
-#define PORT     ":587" /* it is a colon+port string, but you can set it
-                           to "" to use the default port */
 #define FROM     "<sender@example.com>"
 #define TO       "<recipient@example.com>"
 #define CC       "<info@example.com>"
@@ -46,7 +41,7 @@ static const char *payload_text[] = {
   "From: " FROM "(Example User)\r\n",
   "Cc: " CC "(Another example User)\r\n",
   "Message-ID: <dcd7cb36-11db-487a-9f3a-e652a9458efd@rfcpedant.example.org>\r\n",
-  "Subject: SMTP TLS example message\r\n",
+  "Subject: SMTP multi example message\r\n",
   "\r\n", /* empty line to divide headers from body, see RFC5322 */
   "The body of the message starts here.\r\n",
   "\r\n",
@@ -125,20 +120,12 @@ int main(void)
   recipients = curl_slist_append(recipients, TO);
   recipients = curl_slist_append(recipients, CC);
 
-  curl_easy_setopt(curl, CURLOPT_URL, "smtp://" SERVER PORT);
-  curl_easy_setopt(curl, CURLOPT_USERNAME, "user");
-  curl_easy_setopt(curl, CURLOPT_PASSWORD, "secret");
+  curl_easy_setopt(curl, CURLOPT_URL, "smtp://smtp.example.com");
   curl_easy_setopt(curl, CURLOPT_READFUNCTION, payload_source);
   curl_easy_setopt(curl, CURLOPT_READDATA, &upload_ctx);
   curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
   curl_easy_setopt(curl, CURLOPT_MAIL_FROM, FROM);
   curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
-  curl_easy_setopt(curl, CURLOPT_USE_SSL, (long)CURLUSESSL_ALL);
-  curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
-  curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
-  curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
-  curl_easy_setopt(curl, CURLOPT_SSLVERSION, 0L);
-  curl_easy_setopt(curl, CURLOPT_SSL_SESSIONID_CACHE, 0L);
   curl_multi_add_handle(mcurl, curl);
 
   mp_start = tvnow();
@@ -184,7 +171,7 @@ int main(void)
        to sleep. */
     rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout);
 
-    if (tvdiff(tvnow(), mp_start) > MULTI_PERFORM_HANG_TIMEOUT) {
+    if(tvdiff(tvnow(), mp_start) > MULTI_PERFORM_HANG_TIMEOUT) {
       fprintf(stderr, "ABORTING TEST, since it seems "
               "that it would have run forever.\n");
       break;