alt Hacker NewsOne Apple Mail feature nobody here has commented on was called Piano Mover internally. I don’t know the public marketing name. It lets attachments over 10MB in emails be replaced with iCloud hosted file references.
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Onavo • today at 4:51 PM
I think every major email hosting provider (that's not a dumb IMAP only platform) has some variant of this.
the marketing name is "Mail Drop", and it is separate from iCloud mail; though it should only fire if there's a 20mb+ attachment on the email.
cloudd is used by a shit-ton of services though, so I'm not sure how to track it down without better tracing of what actually initiated the call, or the contents of the call.
edit: tomasf nailed it - https://news.ycombinator.com/item?id=49158388