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A comment on RFC7505 Means Yes, Your Domain Can Refuse to Handle Mail.

Re:RFC7505 Means Yes, Your Domain Can Refuse to Handle Mail by jsmith99 on Tuesday February 23, 2021 @08:29AM (#26236980)
gov.uk advice is to set up a null dkim record if you don't send email, so you can't be spoofed.

https://news.ycombinator.com/item?id=25210245

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