72 Definitive Reasons Why Your Emails are Going to SPAM (Reason 27 Will Blow Your Mind)
SendX
JANUARY 22, 2019
Check out this paper from Microsoft Research that talks in depth about this topic. You will find very similar patterns in phishing emails as well. Quite simply email authentication means - that you (owner of the domain) are giving required permissions to a 3rd party ESP (like SendX), to send emails on behalf of your domain.
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