You can flag important email messages, create flagged mailboxes, and flag messages from VIPs. You can also block messages from specified senders.
You can flag an important email message to make it easier to find later. A message you flag remains in your Inbox and also appears in the Flagged mailbox.
Go to the Mail app .
Flags you add to a message appear on that message in Mail on all your Apple devices where you’re signed in to the same on your iPad.
Tap Filter emails in Mail on iPadSearch for email in Mail on iPad