Can a Next.js variable containing an email API key use the NEXT_PUBLIC_ prefix?
No. That prefix is intended for browser-visible configuration, so an email API key must remain available only to the server-side email integration.
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More FAQs in Which environment variables must be configured in production?
No. Review what the deployed code requires, configure the intended production values, and omit unused development integrations or credentials that should not reach production.
Validate that the expected variable exists and passes safe configuration checks, then report its name and the failure category without logging the credential itself.
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