Two screenshots provided. My question follows the second screenshot.

#1- When I create a new email message and type ‘Mike’ into the “To” field, the first suggestion in the dropdown is MCzarnik@protia.com. However, that is not a working address. I can delete it with the ‘X’, but unlike other platforms the next time I create a new email the same thing happens again.

#2- MCzarnik@protia.com does not exist in Mike Czarnik’s Contact entry.

Question:  How can I banish MCzarnik@protia.com from this platform?