What can trigger an "email forwarding" rule in Exchange?

An "email forwarding" rule in Exchange is activated by specific conditions that a user has set up intentionally to redirect their incoming emails to another address. This functionality allows users to manage their email flow according to their individual needs, such as forwarding messages to a colleague while on vacation or directing emails to a secondary email account for convenience. By utilizing conditions like specific senders, keywords in the subject line, or certain times of day, users can tailor how and when their messages are forwarded.

Other scenarios listed, such as a manual request for email backup, a system-wide email outage, or an incoming email from a specific domain, do not inherently serve to trigger forwarding rules. Manual requests for email backup involve backup processes rather than active email handling, while outages impact system availability and do not facilitate forwarding actions. Although an incoming email from a specific domain might meet one of the user-defined conditions for forwarding, it alone does not constitute a complete forwarding rule trigger without additional parameters established by the user.