By "address book" are we talking about the "People" app in Windows 10?
OR
Are you talking about a contacts list in some mail client or other (not native to Windows 10)?
I better give up. What is an email client? Centurylink is my provider. I simply click on COMPOSE and type a letter after To. Don't know what else.AND.......
You still haven't answered my question(s).
What email client are you using to produce the email.
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