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Proprietary IM networks are just that. Email is based on standards, with RFC's defining behavior. Moreover, proprietary IM is based on a some level of membership in that network. Email is open and often involves individuals outside of Apple's iCloud network, users who haven't agreed with Apple to any terms of service or the like.

Sure email is but spam isn't in the RFC is it? That doesn't get delivered straight to your email inbox, or emails from domains that are on blocklists.

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