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Google Gmail continuously nagging to enable Enhanced Safe Browsing
(www.bleepingcomputer.com)
This is a most excellent place for technology news and articles.
Yes an MX dns entry only applies to email, you can have other entries (A, AAAA) for a normal server.
So I would add a MX entry and set it to the ip of the Proton Mail Server?
Yes, the extra details are documented here https://proton.me/support/custom-domain
Cool, thanks