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Why I ditched Gmail for Proton Mail
(www.androidpolice.com)
This is a most excellent place for technology news and articles.
I believe this is already the case; domain reputation is weighted pretty heavily by Gmail and others, so it will take some months before you’ve established enough rep. Following SPF/DMARC/DKIM is crucial, followed with time your domain has been registered and typical outbound volume from your domain.