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I use Apple Mail.app daily, and I've noticed that sometimes it auto-completes email addresses that it shouldn't know about.

For example, if I'm on mac "one", Mail.app knows about email addresses that I've encountered on other machines that I use, but that I'm positive have never "passed through" mac "one". I've checked the contacts in Contacts.app (local and iCloud), as well as all the local mail boxes managed by Mail.app.

On other machines, these email addresses have been seen by other instances of Mail.app, even though their configurations are independent from mac "one".

The only thing that links the macs is my iCloud account, but "Mail sync" is disabled.

I am trying to understand how Mail.app builds its list of known contacts, where it's stored on disk, and how it syncs them between macs.

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  • If you open contacts app, you can find entries under Siri found in Apps, with sender's name and mail. You didn't add them, but they are in the app.
    – anki
    Commented Sep 7, 2019 at 20:05
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    Thanks @ankiiiiiii, but these email addresses don't appear in my Contacts.app list. They don't appear anywhere else on this mac, in any app.
    – tompave
    Commented Sep 8, 2019 at 0:59
  • How many email accounts do you have added to the Mail app? This would aggregate from all accounts added.
    – user346200
    Commented Sep 12, 2019 at 6:02
  • Several accounts, and none of which has ever seen the auto-suggested email address. It's from a contact I have never interacted with on that specific mac.
    – tompave
    Commented Sep 12, 2019 at 11:57

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