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jerry.barnabee--- via Mailman-Users writes:
CPANEL does all the heavy lifting for me - e.g. I don't have to add any code anywhere - the only thing that I have to do is make sure the correct spf, dkim and dmarc dns records exist on my name server for each of my domains- which they do. Pretty sure opendkim is not being used by CPANEL.
I assume that cPanel uses *something*, and that it's reasonably sane by default. The combination of Mailman and cPanel is common enough that I expect we would be inundated with complaints about DKIM if it wasn't. Unfortunately, cPanel doesn't seem to provide publicly available documentation, so I can't say more than that.
I check if I can see any DKIM settings in EXIM
Exim4 (unlike Postfix and Sendmail) does implement DKIM itself. It uses different criteria (probably settings in individual router or transport stanzas?) to determine how to sign a message. As far as I can see, there's nothing like the SenderHeaders parameter Mark mentioned. The documentation for current Exim4 and DKIM is in https://exim.org/exim-html-current/doc/html/spec_html/ch-dkim_spf_srs_and_dm... It looks pretty straightforward (but I haven't configured an Exim4 system in a decade).