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This option allows you to stop Phabricator from sending data to most external services: it will disable email, SMS, repository mirroring, remote builds, Doorkeeper writes, and webhooks.

This option is intended to allow a Phabricator instance to be exported, copied, imported, and run in a test environment without impacting users. For example, if you are migrating to new hardware, you could perform a test migration first with this flag set, make sure things work, and then do a production cutover later with higher confidence and less disruption.

Without making use of this flag to silence the temporary test environment, users would receive duplicate email during the time the test instance and old production instance were both in operation.