Validating an SMTP server

Simson Garfinkel simsong at
Mon Sep 7 19:02:17 CEST 2015

Hi Hoggins.

I am developing an alternative TLSA tester. Viktor Dukhovni has been providing me some assistance and my tester is not fully operational yet. 

Both my tester and Viktor's tester say that your mail server verifies.

However, in both cases you actually want to validate (unless you want people to send email to user at Both testers also say that is acceptable.

If you want to give my tester a try, you can try it at:

It is much more verbose than the tester.


> On Sep 7, 2015, at 8:09 AM, Hoggins! <fuckspam at> wrote:
> Hey there !
> I'm trying to validate my DANE records against my SMTP server, but I'm facing something that I cannot understand, because I believe I'm lacking some details about the validation failure : I'm trying to validate It gives me an error on the validator ( <>), but I don't know what I need to change about that.
> Is there a way to be more verbose about the validation failure ? Maybe some client-side checking I can do manually ?
> Thanks.
>     Hoggins!

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