Henry Crun is fed up with suggestions. He writes:
How can I get rid of all the email addresses iOS has collected and insists on offering up when i’m trying to select something? Personally, I only want iOS to offer addresses that are listed in my Contacts app. i can see some wanting more but what iOS currently offers is the kitchen sink.
If you toggle off Contacts in Mail in Settings, Apple claims it’ll delete any unconfirmed contacts. But “unconfirmed” by whom? Apparently not by me, because it’s off and yet all those unwanted contacts still show.
Henry also finds that if he sets up an iOS device from scratch, iCloud syncs all those addresses, too.