Phishlabs/Fortra are continuing to cover DKIM and other aspects of email security.
This article is titled DKIM vs. SPF Email Standards: Do I Need Them Both? which argues that both DKIM and SPF should be used and even brings DMARC in the picture too.
We have Wikipedia articles up as terms for these up on our EMHS page.
I found this quite interesting as we probably have people who are needing to know this and might be wondering these things.
Feel free to give the article a look if you need it.
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