DMARK, DKIM and SPF – deep dive useful links (with focus on O365)

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Sometimes it is good enought to have a place where you got a reliable links where are all the information needed – as this blog purpose it to be my notepad also to let me remember thigs for a longer time, will place them here. Especially DKIM – it is broadly presented on the Internet, but I was not able to find a place where everything will be described from A to Z. So here is a portion of usefull links about mentioned mechanisms.

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