3 ms·

Not the person you replied to, but as far as I've heard it's done with SmartScreen matches.

• sheikheddy 3y ago
  This is correct but not the only reason it could be happening.
  • currysausage 3y ago
    But why do you consider this good practice? It's (unnecessarily?) frustrating for senders and poses a legal risk for recipients (the sender has the logs to prove that they sent the invoice, while the recipient doesn't have any record).
    • Avamander 3y ago
      Again, not the person you replied to. But some feedback mechanisms take time (so action has to be taken after a 2xx reply) and some indicators are just very very very accurate that leaving them in even just Spam is a way bigger risk. Users have a terrible tendency to dig out malware from Spam folders.
      • currysausage 3y ago
        This was not the cause in my case (no attachments, no URLs, just plain text, as far as I can remember). I know how to send email (ask mail-tester.com). Regardless, there are always better options than silently discarding the whole email: delete attachments, erase everything that looks like a URL, even erase the whole message body, but please tell the recipient that you accepted an email and from whom.