Re: Reverse DNS testing

[David OBrien <dgobrien@xxxxxxxxx>]

On Jul 12, 2012, at 2:17 PM, Al wrote:

> I want to do a rDNS check on a admin entered host name to insure in-coming mail servers don't reject mail, sent by my app, because the rDNS doesn't exist or doesn't match.
> 
> Here is the fundamental code:
> 
> $host = $_SERVER['SERVER_NAME']; //site name shared or not
> $ip = gethostbyname($host);
> 
> $hostName = gethostbyaddr($ip); //May be different on a shared host
> $ip2 = gethostbyname($hostName);
> 
> The $ip works fine.
> 
> However, one of the shared hosts I'm working with returns this instead of the original $host
> 
> gethostbyaddr($ip)=> 93.247.128.148-static.foo.com [foo is subs for actual]
> 
> gethostbyname($hostName)=> 93.247.128.148-static.foo.com  It appears
> gethostbyname() is just returning $hostName because it is not legit.
> Using just the foo.com in gethostbyname() returns the host's server IP.
> 
> Thus, the typical rDNS check fails for this site. Several online checks also report rDNS fails.
> 
> Any suggestions how I can handle this?
> 
> 
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It appears the RDNS for that ip has not been mapped to the server name

do you have control of the DNS servers?

can you check the dns config?
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