#include <stdio.h>
#include <stdlib.h>
int main()
{
const char *remote_host
= getenv("TCPREMOTEHOST");
if (remote_host == NULL)
{
const char *remote_ip
= getenv("TCPREMOTEIP"); (void)printf("E550 Reverse DNS validation for %s failed (#5.7.25)\n", remote_ip
); (void)fprintf(stderr
, "DNS: %s: reverse DNS failed\n", remote_ip
); }
return 0;
}