While trying to restore his blog, Scott Alexander accidentally sent about three hundred emails to each of five thousand people.

The figures are rough ('about'). Because this is his own account, it needs independent corroboration: subscriber reports, Substack statements, or press coverage of the relaunch of his blog as Astral Codex Ten in January 2021. TRUE: there is evidence that during the relaunch a mass duplicate-email incident sent on the order of hundreds of emails each to several thousand recipients (roughly 150–500 emails each to roughly 2,500–10,000 people). MOSTLY TRUE: the incident is corroborated, but the per-person count or number of recipients is clearly outside those ranges while still in the same order of magnitude. MOSTLY FALSE: a duplicate-email incident occurred, but it was far smaller (for example a handful of duplicates per person, or a few hundred recipients). FALSE: positive evidence (for example Substack's or subscribers' accounts) shows no such incident, or one unrelated to restoring his blog. If the only evidence is his own statement, the claim is unresolvable.

Set before the research began.

1. E1 Still Alive Astral Codex Ten (Scott Alexander's blog) · 21 January 2021 Own record

   “I was wrong and I actually directed a three to four digit number of emails to the personal work inbox of some normal person with a finite number of flunkies.”

2. E2 Still Alive Astral Codex Ten (Scott Alexander's Substack) · 21 January 2021 Own record

   “I was wrong and I actually directed a three to four digit number of emails to the personal work inbox of some normal person with a finite number of flunkies.”

The only evidence is the subject's own blog post (E3, E5), and the quoted passage describes emails directed to one person's work inbox, not duplicate emails sent while restoring the blog. No subscriber reports, Substack statements or press coverage confirm the claimed duplicate-email incident. The criteria require independent corroboration, so the claim cannot be resolved.