Re: Can't send mail to aol

[Brian Candler <B.Candler at pobox.com>]

On Tue, Jun 05, 2001 at 01:42:54PM +0100, didier at cs-net.cd wrote:
> >>> MAIL From:<didier at cs-net.cd>
> <<< 421 SERVICE NOT AVAILABLE, TEMPORARY DNS FAILURE

It is trying to check the domain name of your sender address, and it can't.
So either your DNS is broken, or AOL's DNS resolving is broken.

Having a quick look:

;; AUTHORITY SECTION:
cs-net.cd.              1D IN NS        dns.cs-net.cd.
cs-net.cd.              1D IN NS        mail.cs-net.cd.

;; ADDITIONAL SECTION:
dns.cs-net.cd.          1D IN A         194.7.39.155
mail.cs-net.cd.         1D IN A         194.7.39.155

Errm, having two identical nameservers does _not_ make for resilient DNS.
You need to read RFC2182, carefully. If there is any reason why AOL's
nameservers couldn't ping 194.7.39.155, then your DNS would fail completely.

Regards,

Brian.

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