Right. And if you mandate dkim, as seems to be the case with servers that demand dmarc, what's the issue? You reject the emails where dkim isn't set.
Or do you think it's critical to support mail that doesn't have dkim?
You'll have a bad time if you just drop all emails without DKIM. There are many large senders that do not care about well established email standards and you will drop important emails.
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