Private email that keeps quiet. Every shop gets its own address for you, and nothing in a letter can follow you home.
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Every shop address is made for one shop, so a stranger who uses it gives the game away. Mum tells you who wrote and which address they used, and you decide what happens next.
When Mum books a table, a class or an appointment, the place gets an address made just for that booking. The confirmation comes back to it, Mum checks it against what you agreed, and it goes in your calendar. If they need to change something, Mum asks you before it replies.
Six promises about your mail, in plain words.
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