How to add new mailboxes on iPhone and iPad Tap on it to see a list of all your flagged messages. Once you have a message (or messages) flagged, a special Flagged mailbox will appear in your Mailboxes list. If the messages you chose were already flagged, you can instead tap Unflag.

Select the message(s) you'd like to flag.Tap Edit in the upper right corner of your screen. How to flag an email message on iPhone and iPad If the messages you chose were already read, you can instead tap Mark as Unread. Choose any email messages you'd like to mark as read.Launch the Mail app from the Home screen of your iPhone or iPad.How to mark an email as read or unread on iPhone and iPad