Newsletters can be useful, but they can also become a long-term tracking and spam source. Choose the email layer based on how much you trust the sender.
Use Temporary Email When
You only need a download link, coupon code, or single confirmation message. If you do not plan to read future emails, do not give your primary inbox.
Use an Alias When
You may want to keep reading but also want the option to disable the sender later. Aliases are usually the best fit for newsletters.
Use Your Real Inbox When
The sender is trusted, important, and connected to work, school, finances, or personal relationships.
Cleanup Habit
Review newsletters monthly. If you have not opened one in a while, unsubscribe or disable the alias.