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Microsoft mishandling example.com
TL;DR: Since at least February 2020, Microsoft's Autodiscover service has incorrectly routed the IANA-reserved example.com to Sumitomo Electric Industries' mail servers at sei.co.jp, potentially sending test credentials there. Problem While setting up email@example.com as a dummy account in Outlook (on both Windows and macOS), Outlook consistently auto-configured it to use imapgms.jnet.sei.co.jp (IMAP) and smtpgms.jnet.sei.co.jp (SMTP) despite example.com being an IANA-reserved domain that should not resolve to real services.
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