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This is just a suggestion, but in 99 % of cases, the DKIM domain could be guessed by the value of
app.url
and wouldn't need to be set manually. Even if many users would need to override this, having a sensible default wouldn't hurt. I also addedDKIM_ENABLED
to have a more explicit way of enabling and disabling the DKIM signing.dkim.enabled
should probably befalse
by default, but implementing it this way ensures backwards compatibility. If you prefer a clean, breaking change, that could be adapted very easily.