The git-multimail tool provides a mechanism to verify whether it has been installed and configured correctly before being relied upon for production notifications. This verification is done using an environment variable namedGIT_MULTIMAIL_CHECK_SETUP. When this variable is set to anon-empty string, git-multimail performs a setup validation and outputs diagnostic information toconfirm that configuration values, hooks, and parameters are correctly defined. This helps prevent silent failures where commits occur but email notifications are not sent. Options that referenceGITHUB_MULTIMAIL_CHECK_SETUPare incorrect because git-multimail is not limited to GitHub and does not use that variable name. Additionally, setting the variable to an empty string does not trigger the setup check. Ensuring proper configuration during the Code stage is important because it supports auditability, traceability, and timely communication among development and security teams. Therefore, Brett must run the environment variableGIT_MULTIMAIL_CHECK_SETUPwith a non-empty value to ensure the tool is set up appropriately.

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