Icloud Email address
People can't send me emails to my icloud account. Is it because I don't have enough storage space? It comes back to them with an error message. ?
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Storage is one possibility. The following has information on how you can see how much storage you are using: Manage your iCloud storage - Apple Support
If that isn't the cause, it may help someone provide more information if you posted the exact wording of the error message.