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Knowledge Base & Operational DocumentationHow to Investigate a Security Alert for a Newly Added Mailbox Rule
A new inbox rule may organize messages or secretly forward, delete, or mark security notifications as read. Rules can hide account takeover activity from the user.
What to check
Review rule creator and time, actions, forwarding destinations, mailbox audit logs, sign-ins, and any recent authentication changes. Check deleted items and other mailboxes accessed by the same identity.
Recommended next step
Disable suspicious rules, revoke sessions, secure the account, and preserve evidence. Notify the user through a trusted channel and assess whether messages or attachments were exposed.
How Informatix Systems can help
Informatix Systems provides security operations and email incident response services. We can review the affected setup, narrow down likely causes, and help plan a practical fix. Contact us with the platform involved, when the issue began, and non-sensitive error details.