Autofill email address

Unable to delete an email address auto suggestion, it has no red cross! (Win 8.1, Ver 223440)
Is the file directly editable?

Hello Peter, if the contact doesn’t have the red cross next to it this means the contact is saved in one of your contacts folders, most likely in your account’s contacts folder, please make sure you’ve removed this contact to avoid showing of this email address in the suggestions.

Ah Ha yes that was where it was, thanks!