Is it possible to somehow get 2FA for my e-mail accounts even if they're hosted on custom / private domains? (e.g firstname.lastname@example.org and not gmail)
closed as unclear what you're asking by Lie Ryan, Xander, Tobi Nary, AndrolGenhald, Teun Vink Jan 9 at 6:33
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It depends what email service you're using. I'm using Office 365 with my private domain name which does support MFA so I can enable it on my email account(s).
I think, you expect to enable 2FA on your web server not in web site. It is possible on Apache server, when you use ssh.
I think below link will be helpfull for you.
If you are running the server, then yes eg: https://www.wikidsystems.com/support/how-to/how-to-configure-webmail-for-wikid-strong-authentication/. If not, then no.