Re: [exim] Finding Fallback DKIM Domain

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Autor: Andrew C Aitchison
Data:  
Para: Christian K
CC: exim-users
Asunto: Re: [exim] Finding Fallback DKIM Domain
On Mon, 28 Oct 2019, Christian K via Exim-users wrote:

> Hi,
>
> I?m trying to sign all mails with DKIM from all subdomains of certain
> domains with the key of the ?main? dkim domain. Or in other words I
> want to find the dkim fallback domain to know which key I need to use
> for signing.
>
> Some examples for what domains I need to find the key for:
> foo.example.com -> example.com
> foo.bar.example.com -> example.com
> foo.example.co.uk -> example.co.uk
> foo.bar.example.co.uk -> example.co.uk
>
> I thought about using some regex substitution but with double domains
> it?s not that?s easy.
>
> Is there another way to achieve this?


The Public Suffix list https://publicsuffix.org/
may help you determine when you need "double domains".

-- 
Andrew C. Aitchison                    Kendal, UK
             andrew@???