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#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;
}