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A comment on How to prevent email spoofing, using an unholy combination of silly standards. Parent comment

Re:How to prevent email spoofing, using an unholy combinatio... by teddyh on Monday August 16, 2021 @04:05AM (#28195957)
> Is there an easy tool to check how many chain-on dns lookups happen?

I use https://www.kitterman.com/spf/validate.html

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