K9 Adressbook anotherone as Contact (Android)

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I come again to this question. From which contacts K9 fetches the Mail-Adresses. It is not only Android Contact as it shows me Adresses which I have neer stored in Android contacts…

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Depends on where the addresses are displayed to you…

Many keyboards, e.g. Google’s Gboard, store whatever you have entered ever. Whenever you type something, it will display auto-complete suggestions.

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… and in Gboard you can delete all “learned words and data”, under it’s “privacy” option. There doesn’t appear to be a way to selectively delete things from its learned words/addresses.