ChangeChecklist

Every step below is from an official source

Switch from Gmail to iCloud Mail

What to do at Gmail before you leave, what iCloud Mail needs when you join, and everything else the switch touches. Your full plan is built in your browser and stays there.

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Read the email address guide

At Gmail, before you leave

  1. Forward new Gmail messages to your new addressBefore

    In Gmail settings, open the Forwarding and POP/IMAP tab and click Add a forwarding address. Click the verification link sent to the new address, then select Forward a copy of incoming mail to and save.

    Automatically forward Gmail messages to another account - Gmail HelpGoogle. Reviewed
  2. Expect only new mail to be forwardedDuring

    Gmail forwards all new messages to the other account, except spam.

    Automatically forward Gmail messages to another account - Gmail HelpGoogle. Reviewed
  3. Download your mail and contacts with Google TakeoutBefore

    Go to the Google Takeout page, choose which products to include, then select Create export. Contacts are exported as vCard.

    How to download your Google data - Google Account HelpGoogle. Reviewed
  4. Know that a removed Gmail address is retiredAfter

    Download your data before removing Gmail. Gmail deletes your emails and settings after 30 days, and no one can use your Gmail address in the future.

    Remove Gmail from your Google Account - Computer - Gmail HelpGoogle. Reviewed

At iCloud Mail, when you join

  1. Import contacts from a vCardDuring

    At icloud.com/contacts, select the Add button, choose Import Contact, then select a vCard. Imported contacts are added to the All Contacts list.

    Import, export, or print contacts on iCloud.comApple. Reviewed
  2. Import old mail to a custom domain addressDuring

    If you use your own domain with iCloud Mail, you can import existing emails from your previous provider on iCloud.com. This isn't available for all providers, and you need enough iCloud storage.

  3. Move other emails by hand with MailDuring

    You can also move emails into iCloud Mail yourself using the Mail app on iPhone, iPad or Mac.

Then: everything else the switch affects

The steps above are what Gmail and iCloud Mail say. Your full checklist adds the accounts, codes, payments and devices that depend on your email provider, in a safe order. It's built from your answers, in your browser.