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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 always worry that it will get bought out by some asshole company and we'll be even worse off than with Google (if that's even possible).
That’s the benefit of a custom domain, I suppose; you can always change he provider without changing your email.
Problem is with the way email security is going now, it's entirely possible in a few years, if your domain/provider isn't an established one, it will get blocked by others.
I've had a few domain just straight up block some Tutamail emails.
But here's the other issue: Proton and Tutanota are both not going to make it easy on you to move your mail.
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.