CVE-2000-0216: Microsoft email clients in Outlook, Exchange, and Windows Messaging automatically respond to Read Receipt a...

Security readout for executives and security teams

This old issue describes Microsoft mail clients automatically replying to read or delivery receipt requests. A forged receipt request could redirect many automatic replies to a large distribution list, creating a mail flood and disrupting email service. Exposure is most plausible in legacy Microsoft mail environments where clients or servers still generate automatic receipts and large distribution lists can receive or expand redirected receipt traffic. Specific affected versions are not identified in the provided sources. Prioritize this if the organization still operates legacy Microsoft mail infrastructure or externally reachable large distribution lists. For modern supported environments, urgency is lower unless validation finds automatic receipt behavior that can amplify mail floods. Mitigation focus: Check Microsoft or vendor guidance for supported products and receipt-handling remediation.; Review whether automatic read and delivery receipts are still enabled in legacy mail paths.; Restrict external or unauthenticated posting to large distribution lists where business allows..

Prepared

Jul 12, 2026, 06:16 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.