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To explain how this happened, we have to go into the weeds of their correspondence.

How to avoid this mistake yourself

The iPhone feature in question can be useful.

A hand holding an iPhone showing a guide to new Apple Intelligence features in the Mail app

That can help keep your contacts book up to date.

But evidently, the feature can sometimes get things wrong.

From here, suspend the toggle next toShow Contact Suggestions.

An iPhone on a blue background showing the Apple Intelligence and Siri settings page

This will prevent your iPhone from automatically suggesting new phone numbers, emails and addresses for your contacts.