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If I'm switching to user@example.com emails and using a third-party email service provider that I trust (for example, Google Apps), what potential security threats do I need to secure my system against?

Note that I am not referring to security threats pertaining to the email provider here (e.g. so I'm not talking about my Google Account's password or 2-factor authentication here).

Rather, I'm talking about the parts of the system that come before that.

For example, one thing I can think of is locking my domain name so it can't be transferred (ClientTransferProhibited), although that's pretty general, and not specifically email related.
What else do I need to guard against?

closed as too broad by Anders, Xander, kasperd, John Deters, Rory Alsop Dec 19 '16 at 9:00

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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one security threat is about content, and you can use PGP for encrypting your email, PGP is end-to-end and if you use a strong key your email provider can't decrypt your emails in reasonable time and cost.

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