The issue is that some developers have configured the registry field in their .npmrc file incorrectly. Ideally, sending out a memo telling everyone to fix it should do it. If not, one way to fix it is to commit the .npmrc with the correct configuration (assuming it doesn't include secrets). If all else fails, an ugly hack is to make a preinstall hook that fixes the .npmrc file.

This is likely referring to the .npmrc registry field.

I think the story we're all commenting on demonstrates how unlikely a single email is going to fix it.