Email replies create new conversations instead of threading

When a customer replies to an existing support email, Featurebase creates a new conversation instead of continuing the original thread.

This fragments discussions, duplicates issues, and makes reporting and tracking harder.

Even when replying directly to the Featurebase parse address, the reply does not attach to the original conversation and instead creates a new one.

Email replies should automatically continue the existing conversation using standard email threading logic, so each issue stays in a single unified thread.

To rule out our email routing setup, I tested by emailing your parse address directly (67bf384531699adad8f294e6@parse.featurebase-mail.com), received the reply from Featurebase, and replied back from my email client. It still created a brand new conversation rather than continuing the existing thread.

So the issue appears to be on the Featurebase side rather than our DNS or Google Workspace routing.