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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.
Protons free service doesn't offer mail forwarding. Free gmail does that. Which means that in many ways, protonmail will lock you in. Which is not great.
If you're gonna switch to protonmail, at least use a custom domain. At least then, you can easily switch your provider, without having to change address.