Helo, DNS, Domain/IP reputation, Blacklist SPF, DKIM, DMARC and ARC

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As a kind reminder, the wiki holds tons of information on various topics, not just NSx specific. A very nice example is th wiki page about Email Methods: Helo, DNS, Domain/IP reputation, Blacklist SPF, DKIM, DMARC and ARC.

Just so you know it.

Many thanks for many extensive, knowledgable wiki pages by @stephdl !

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I try to enhance it, even years after years, the last update was about dmarc that is necessary now if you want to talk with gmail, yahoo, microsoft :smiley:

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