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If your project handles many security reports, it can be helpful to introduce a private security@<project>.apache.org mailinglist. If such a list exists, security reports will be sent to this list instead of to the PMC, and we will no longer respond with a 'receipt confirmation' to the reporter - this is now your responsibility. The list should contain enough PMC members to make sure the project can deal with any incoming messages about security issues responsibly and timely. You can also add trusted committers to this list, if they for some reason cannot or don't want to join the PMC.
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