Hi all,
Please let me know if there is a way to test for proper SMTP server
connectivity using libcurl 'without actually sending an email'.
Although this could otherwise be done with a simple telnet EHLO (or HELO), I
would like to know if it can be accomplished using the libcurl API(s).
My presumption was that, after setting up the SMTP server URL (using
CURLOPT_URL), attempting just a 'FROM' alone (using CURLOPT_MAIL_FROM) would
suffice.
However, doing so sort of causes the code to get stalled (and then, eventually
time out), probably because the library is expecting the 'RCPT' and/or 'DATA'
values too, in order to round up on the easy_perform.
When tried with the attached sample code, (with curl v7.23.1), I do observe
the salutations come from the SMTP server on the other end, which then verifies
the sender address with a 250 OK,
but just stalls after that.
Appreciate if any of you could throw some light on how I could possibly go
about it. Thanks in advance.
Regards,
Naveen
#include <stdio.h>
#include <string.h>
#include "curl/curl.h"
#define URL ("smtp://xx.xx.xx.xx:25")
#define FROM ("<[email protected]>")
int main(void)
{
CURL *curl;
CURLcode result;
curl_global_init(CURL_GLOBAL_DEFAULT);
curl = curl_easy_init();
if ( curl )
{
curl_easy_setopt ( curl, CURLOPT_URL, URL );
curl_easy_setopt ( curl, CURLOPT_VERBOSE, 1 );
curl_easy_setopt ( curl, CURLOPT_MAIL_FROM, FROM );
result = curl_easy_perform ( curl );
if ( result != CURLE_OK )
{
fprintf ( stderr, "curl_easy_perform() failed: %s\n",
curl_easy_strerror(result) );
}
curl_easy_cleanup(curl);
curl_global_cleanup();
return 0;
}
else
{
return -1;
}
}
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