iCloud User Guide
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Import existing email messages to your custom iCloud Mail address on iCloud.com
After you or a member of your Family Sharing group sets up a custom email domain for iCloud Mail, you can use iCloud.com to import existing email messages from your previous email provider (not available for all email providers).
Important: Make sure you have enough iCloud storage to import all your messages. See Check your iCloud storage online or on any device.
On iCloud.com, go to Account Settings, then click Manage in the Custom Email Domain section.
Select a domain name, scroll down, then click the “Import mail” button (or click
next to Import Mail to import messages from an additional address).Follow the onscreen instructions to sign in to your previous mail account.
It may take some time to import all your messages. They appear in an iCloud Mail folder with the name of your email address. If you had your mail organized into multiple folders in your previous email account, those folders appear inside the new folder.
You can also manually move email messages to iCloud Mail using the Mail app. See Organize email in Mail on iPhone, Organize email in Mail on iPad, or Move or copy emails between mailboxes in Mail on Mac.