Re: [Exim] 550 DNS FAILURE with aol

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Autor: Marc MERLIN
Data:  
A: Suresh Ramasubramanian
CC: exim-users
Assumpte: Re: [Exim] 550 DNS FAILURE with aol
On Tue, Aug 14, 2001 at 08:09:27AM +0530, Suresh Ramasubramanian wrote:
> It'd break (for example) virtual hosting setups, where mail.foo.com,
> mail.bar.com and several hundred domains all reverse-lookup to
> colo231.foo-provider.com


No, the rdns check is done as such:
ip address -> fqdn lookup
lookup the fqdn you got back and make sure it maps to that IP address.

After doing that, you log the connection as having come from
colo231.foo-provider.com and ignore the fact that mail.foo.com also happens
to point to the same IP address.

Marc
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Microsoft is to operating systems & security ....
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