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speak_plainly a day ago

Probably Handoff and cross-device application state syncing.

artisinal a day ago | parent | next [-]

Most likely answer so far. While writing an email you can take it over between iPhone, iPad and Mac. Once you hit send it probably gives a “you can stop Handoff now” signal.

lapcat a day ago | parent | prev | next [-]

I've disabled Handoff.

Also, why would Handoff be triggered by sending an email rather than composing an email? Mail app uses IMAP for syncing mailboxes.

gumby a day ago | parent | prev [-]

Why would a local facility like handoff need to talk to the mother ship?