Re: DKIM & extra headers

Jeremy Harris via Exim-users <[email protected]>
Newsgroups gmane.mail.exim.user
Message-ID <[email protected]>
On 2025/09/22 3:01 PM, graeme vetterlein via Exim-users wrote:
>      On my *outgoing* email the DKIM is added late on, so ANY modification I make (headers or body) inside exim will be included in the DKIM signature?

Correct (subject to such headers being defined as part of the signature,
per the transport configuration).

>      On *incoming* email , I use fetchmail and invoke SMTP (exim) to deliver locally , here any modifications (e.g. in filters) will cause DKIM to break (..or is it only Body modifications?)

Modifications done by Exim, or Exim-run filters, will not affect an evaluation of DKIM
that is done by Exim.  They do have potential for affecting an evaluation done
by Thunderbird.
-- 
Cheers,
   Jeremy

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