When you subscribe to iCloud+, Hide My Email lets you send and receive email messages that forward to your real email account, to keep your real email address private. You can also generate unique email addresses on demand in the Mail app.
Go to the Mail app Create and manage Hide My Email in Settings.
When you receive an email message to one of your unique, random addresses, you can reply using the same address. This allows you to continue the conversation and keep your real email address private. To reply, do the following:
Go to the Mail app Use Mail Privacy Protection on iPadSend email in Mail on iPad