[exim] autoreply and DKIM signature ?

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Author: Kurt Jaeger
Date:  
To: exim-users
Subject: [exim] autoreply and DKIM signature ?
Hi!

Recently, I came upon a problem without a solution:

If I trigger an autoreply (for example because of vacations),
how do I get the system to add a DKIM-header for the proper domain ?

This post describes that the recipient of the autoreply
can check the signature by looking for the d=<domain> field
in the DKIM-Signature header:

https://stackoverflow.com/questions/50371039/does-dkim-verify-smtp-envelope-from-or-the-mail-header-from

The problem is that the autoreply driver looses the information
on which sender is used to send out the mail (envelope-from is <>
to avoid mail-loops).

Because of the <> envelope-from, how can the proper sender-domain
(and dkim key) be found on the sending host ?

Thanks for any hints!

-- 
pi@???            +49 171 3101372                    Now what ?


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