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I didn’t know they stored local copies — had a very, VERY quick skim through their privacy policy on their website and couldn’t see any reference to that (sure it’s there but I didn’t see it).
I’m not a Spark user btw, was just following the conversation. I use plain ol’ Apple Mail.
I could be misinformed, but this isn’t just limited to Spark as I understand it, I believe a lot (maybe all?) third-party clients do the same thing. They act as an intermediary between you and the server so they can deliver push notifications.
However, as I understand it, Spark’s privacy policy outlines that they don’t read/scan the contents of your emails, and the use of app-specific passwords rather than your email password ensures they only have access to emails and nothing else.
Pretty sure others such as Canary, Airmail, Edison, etc. all do/did the same thing, but it was the lack of clarity in Spark’s privacy policy that made them the main target for scrutiny. I think they’ve since cleared that up.
I could be mistaken, though.
Yeah I know they’re all based on one of three, but they are all subtly different in what they offer.
So whilst there are three main engines, there are definitely more than three choices.
Bottom of the pile for me is Chrome - I don’t use anything Google knowingly/willingly.