All you need is an Apple ID. Glenn Fleishman has three ways to make it happen:
- If you have an Apple ID without an associated icloud.com address, you can add one (via iOS or macOS).
- If you have an icloud.com address already, you can add aliases (via iCloud.com).
- If you want a separate icloud.com address for email that isn’t an alias, you can create one by creating an Apple ID account (via macOS).