Validating an SMTP server

[Simson Garfinkel]

Thanks for the email.

According to the report, the CNAME lookup of _25._tcp.open.nlnetlabs.nl is bogus.  However it is not, so there is a problem with my CNAME chaser.

I'll check it out.




> On Sep 7, 2015, at 4:46 PM, Viktor Dukhovni <ietf-dane at dukhovni.org> wrote:
> 
> On Mon, Sep 07, 2015 at 08:10:38PM +0000, Viktor Dukhovni wrote:
> 
>> And yet the validator claims the TLSA RRset is "bogus",
>> reports failure:
>> 
>>    http://ec2.simson.net/dane_check.cgi?host=openssl.org
>> 
>> 	BOGUS DNS CNAME lookup _25._tcp.mta.openssl.org. = wildcard._dane.openssl.org.
>> 
>> Something's not quite right here...
> 
> The issue seems to be systemic:
> 
>    http://ec2.simson.net/dane_check.cgi?host=nlnetlabs.nl
> 
> 	BOGUS DNS CNAME lookup _25._tcp.nlnetlabs.nl = 3.1.1._dane-both.nlnetlabs.nl.
> 
>    http://ec2.simson.net/dane_check.cgi?host=spodhuis.org
> 
> 	BOGUS DNS CNAME lookup _25._tcp.mx.spodhuis.org. = _globnix-tlsa.spodhuis.org.
> 
>    http://ec2.simson.net/dane_check.cgi?host=wizmail.org
> 
> 	BOGUS DNS CNAME lookup _25._tcp.wizmail.org. = _cert301.wizmail.org.
> 
> All three are in fact fine.  So the handling of TLSA CNAMEs seems
> to be broken.
> 
> -- 
> 	Viktor.