I am trying to send an email through SMTP and gmail. I get output error
'Login denied' (see attached screenshot for output). I am sure that the
login and the password are correct. I triple-tested them! I am trying to
make a simple program in C++ in order to automate a bit the mailing process
(there are good tools for this but I found them "heavy" for any system!), so
I want to make something "light" for my own purposes only! Note that I am
trying to attach a file to this email (my_attachment.tar.gz)
This is the code I use:
*#include <stdio.h>
#include <string.h>
#include <curl/curl.h>
#include <stdlib.h>

#define FROM "mymail_at_gmail.com"
#define TO "mymail_at_gmail.com"

static const char *payload_text[]={
  "Date: Mon, 29 Nov 2010 21:54:29 +1100\n",
  "To: " TO "\n",
  "From: " FROM "(Example User)\n",

  "Message-ID: <dcd7cb36-11db-487a-9f3a-e652a9458efd_at_rfcpedant.example.org
>",
  "Subject: Hello!\n",
  "\n",
  "See attachments ;).\n",
  "\n",
  "Still reading?\n",
  "Check RFC5322.\n",
  NULL
};

struct upload_status {
  int lines_read;
};

static size_t payload_source(void *ptr, size_t size, size_t nmemb, void
*userp)
{
  struct upload_status *upload_ctx = (struct upload_status *)userp;
  const char *data;

  if ((size == 0) || (nmemb == 0) || ((size*nmemb) < 1)) {
    return 0;
  }

  data = payload_text[upload_ctx->lines_read];

  if (data) {
    size_t len = strlen(data);
    memcpy(ptr, data, len);
    upload_ctx->lines_read ++;
    return len;
  }
  return 0;
}

int main(void)
{
  CURL *curl;
  CURLcode res;
  struct curl_slist *recipients = NULL;
  struct upload_status upload_ctx;
  upload_ctx.lines_read = 0;
  curl = curl_easy_init();
  if (curl) {
    curl_easy_setopt(curl, CURLOPT_URL, "smtp://smtp.gmail.com:587");
    curl_easy_setopt(curl, CURLOPT_USE_SSL, CURLUSESSL_ALL);
    curl_easy_setopt(curl, CURLOPT_FILE, "my_attachment.tar.gz");
    curl_easy_setopt(curl, CURLOPT_USERNAME, "mymail_at_gmail.com");
    curl_easy_setopt(curl, CURLOPT_PASSWORD, "mypaswd");
    curl_easy_setopt(curl, CURLOPT_MAIL_FROM, FROM);
    recipients = curl_slist_append(recipients, TO);

    curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
    curl_easy_setopt(curl, CURLOPT_READFUNCTION, payload_source);
    curl_easy_setopt(curl, CURLOPT_READDATA, &upload_ctx);
    curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
    res = curl_easy_perform(curl);
    curl_slist_free_all(recipients);
    curl_easy_cleanup(curl);
  }
  return 0;
}

*Thx in advance!

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