The article referenced by the article just mentions it was sent to the wrong people. I don't know how this puts blame on any particular email provider.
this post was submitted on 16 Jul 2025
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There are different narratives. What I believe I heard on BBC radio was that the sender intended to just send a few records to the recipient but accidentally sent the full dataset of 18,000 (or 19,000) records.
Other sources, like the one I linked, say the error was that the wrong recipient was emailed.
It’s surprising that as big as the story is, reporting of the tech details is lousy. A couple sources say the data was a spreadsheet, which seems to support what the Guardian says.
It's true. The media often doesn't care about the details, which are the most important bits.