Comment 4 for bug 643224

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Martin Pool (mbp) wrote : Re: dkim whitelist should be in configuration

If/when I get to this, I will probably take this approach: have a
hardcoded list of "generally ok" domains, and allow that to be
overridden by a feature flag. Then we have a scram switch in the case
that we need to suddenly stop trusting one domain, or if we want to
try out a new one.