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I use one dedicated email address per service.

This is a golden rule I started about 20 years ago. Today I have about 700 email addresses in use. The Password Manager keeps track, which Email address is used for which service.

This has several advantages:

• An attacker has no idea which email address I use for a certain service: this makes attacking my accounts a lot more painful
• I can very easily sort incoming email associated with those services
• It becomes more difficult to track me

Lately more and more services do no longer allow me to create an account with an email address I designate.

Instead authentication is delegated to a third party (e.g. Discord, Paypal) and the email address associated with that service is used.

Such a service will never receive any money from me.