I use the Mail App in order to read my Mails: I have an MS Outlook and Telenet (from Belgium) mail account.
Everything works just fine.
In order to have a list of my mail addresses I use the App Personen (Persons in English I suppose).
That works fine as well.
But when I create a new mail or receive a mail I don't see the picture I inserted in the app Personen.
I see a circle with the initials of the mail addressee.
In Instellingen (Settings in English) the setting: "display pictures of senders" is on.
but I see under that setting a statement : "this setting cannont be applied to any of your acconts."

Is this a normal behavior and what can I do to remedy this?
I use Windows 10 version 1909 Home Edition (English version)
My Apps Mail and Personen are in Dutch

thanks in advance for any answer.