SMTP functionality with authentication fails!

[Chandran, Naveen]

Hi Steve,

Attempting to run the attached SMTP code (for sending a sample mail from a 
valid gmail mail account to another, using gmail's SMTP server) fails.
I've tried with ports 25, 465 and 587, but without success.

Even trying to use the 'CURLUSESSL_ALL' option along with the 
CURLOPT_SSL_VERIFYPEER and CURLOPT_SSL_VERIFYHOST set to zero do not seem to 
work!
Kindly let me know if I am missing something very basic here.

Thanks,
Naveen

#include <string.h>
#include "curl/curl.h"

/* Sender / Recipient addresses */
#define FROM      ("<a...@gmail.com>")
#define TO        ("<x...@gmail.com>")

/* Message text */
static const char *payload[] =
{
    "This is a test mail\n",
    NULL
};

struct upload_status
{
    int lines_read;
};

static size_t read_callback ( 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[upload_ctx->lines_read];

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

    return 0;  /* when there is no more data to deliver */
}

int main ( void )
{
    CURL *curl;
    CURLcode curl_result;
    struct upload_status foo;
    struct curl_slist *recipients = NULL;

    foo.lines_read = 0;

    curl_global_init ( CURL_GLOBAL_DEFAULT );

    curl = curl_easy_init();
    if ( curl )
    {
        struct curl_slist* rcpt_list = NULL;

        curl_easy_setopt ( curl, CURLOPT_HTTPPROXYTUNNEL, 1L );
        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_URL, "smtp://smtp.gmail.com:465" );
        curl_easy_setopt ( curl, CURLOPT_USERNAME, "a...@gmail.com" );
        curl_easy_setopt ( curl, CURLOPT_PASSWORD, "xxxxx" );

        curl_easy_setopt ( curl, CURLOPT_MAIL_FROM, FROM );
        rcpt_list = curl_slist_append ( rcpt_list, TO );
        curl_easy_setopt ( curl, CURLOPT_MAIL_RCPT, rcpt_list );

        curl_easy_setopt ( curl, CURLOPT_READFUNCTION, read_callback );
        curl_easy_setopt ( curl, CURLOPT_READDATA, &foo );
        curl_easy_setopt ( curl, CURLOPT_VERBOSE, 1 );

        curl_result = curl_easy_perform ( curl );

        curl_slist_free_all ( rcpt_list );
        curl_easy_cleanup ( curl );
        curl_global_cleanup();

        return 0;
    }

    else
    {
        printf ( "Error: %d", curl_result );
        return -1;
    }
}

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