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> unheard of in email Not true- https://www.theguardian.com/technology/2022/aug/22/google-csam-account-blocked https://www.theguardian.com/technology/2022/aug/

• ryangibb 4y ago
  I think the parent comment was referring to blocking access to other server instances rather than blocking individual users. Overzealous spam filters seem like the email equivalent. I have reoccurring issues trying to get self hosted email received by GMail/outlook addresses. Although these filters are an impersonal corporate policy rather than up to an individual instance admin's discretion.