Pre dkim enable precautions

OS type and version ubuntu 20.04
Webmin version 1.991
Virtualmin version 7.0-4
Related packages postfix 3.4.13, spamassassin 3.4.4, dovecot, bind 9.16

my original config started on ubuntu 16.04 before postfix sni support and followed all the recommendations at the time whereby a domain is registered just for webmin, and that all your virtual servers send mail from.

and while dns is enabled for my virtual servers, it’s actually hosted externally. that isnt the case for the webmin domain though.

so it ought to just be a matter of email settings > domainkeys idenified mail > ..., then copy the virtual servers’ generated keys to external dns and done, right? but if something goes awry, what am i going to want to backup beforehand? preferably something as targeted as possible, as ive experienced issues with broader virtual server level restores.

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