Why does Mail app contact iCloud when sending a non-iCloud email?

Apple Mail sends a mystery signal anyway, and the comments went full tinfoil

TLDR: A developer found Apple Mail contacting iCloud while sending regular email, even with Apple mail syncing turned off, and couldn’t tell why. The comments split fast between “this is creepy tracking,” “all big tech does this,” and “you gave up privacy the second you chose convenience.”

A Mac user noticed something deeply weird: even when Apple’s Mail app was only sending messages between non-Apple email accounts, the computer still tried to contact iCloud, Apple’s online service. They say Mail’s iCloud features were switched off, yet the app reached out anyway the moment an email was sent. Worse, the user couldn’t see exactly what was being sent because Apple’s system is locked down too tightly to inspect, so the internet was left with the most combustible fuel of all: a privacy mystery with no clear answer.

And wow, the comment section did not stay calm. One camp instantly went nuclear, with accusations of surveillance dressed up as security and jokes about everyone needing a “tinfoil hat.” Another group rolled their eyes and basically said, please, your computer talks to big tech companies all day anyway; one commenter compared it to Windows constantly pinging Microsoft for no obvious reason. Then came the practical Apple defenders, suggesting it might be something mundane like syncing app state between devices, the kind of convenience feature people love until it looks creepy. The funniest reaction came from users openly admitting they’ve made peace with the trade-off: they want AirDrop, shared clipboard, and easy messaging, and yes, maybe that means accepting a little spooky background chatter. In other words, the real drama wasn’t just Apple’s mystery connection, but the internet’s eternal cage match: privacy paranoia vs convenience addiction.

Key Points

  • The author says Apple Mail contacts iCloud when sending email between non-iCloud accounts, even though Mail is disabled in iCloud settings.
  • The reported behavior was observed repeatedly using Little Snitch.
  • The article identifies two iCloud CloudKit-related endpoints contacted by `cloudd` and `nsurlsessiond` on `gateway.icloud.com`.
  • The author could not inspect the connection payload because iCloud uses certificate pinning, and a network extension also did not expose unencrypted data.
  • The author decided to block `cloudd` and `nsurlsessiond` from connecting to `gateway.icloud.com`, except when testing iCloud sync for development.

Hottest takes

"surveillance, masquerading as protection" — bantunes
"Everyone wearing their tinfoil hat while using Gmail" — zer0zzz
"I deserve consequences of my love of convenience" — Barbing
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