Re: [exim] DKIM signing options - specially list of headers

On 07/31/2018 12:08 PM, Graeme Fowler via Exim-users wrote:
> X-Mailman-Original-DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt;
> c=relaxed/relaxed;
> d=open-t.co.uk; s=20170820; h=Content-Transfer-Encoding:Content-Type:...
>
> The second one has included headers which I would not expect to be present on a message from a client to a mailing list. It also includes them in the DKIM sig - yet they don't exist, or shouldn't, at the submission stage.

Oversigning. It gives an assertion that the header is not present.
Exim can do it; it's not default - see the last para. in the description
of dkim_sign_headers.
--
Cheers,
Jeremy