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CI / test (push) Successful in 8s
Discovered while verifying the TestCampaign fix against real listmonk: create/update apparently default an omitted messenger to "email" server-side, but the test-send endpoint validates the raw request body without that same defaulting, failing with "Unknown messenger .". eec-campaigns only ever targets email, so send it explicitly instead of depending on an inconsistency between endpoints. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>