Possible workarounds: * I can create a filter in Thunderbird with action "Redirect to". I haven't tested it, but it seems to be at least a workaround for some use cases. * It could be done on the server. It might require moving to an email provider that allows this, but if your company depends on it for its workflow, it seems like an option to consider. I agree that a proper bounce should be a feature of core Thunderbird.
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Possible workarounds: * I can create a filter in Thunderbird with action "Redirect to". I haven't tested it, but it seems to be at least a workaround for some use cases. * It could be done on the server, depending on the server capabilities. I agree that a proper bounce should be a feature of core Thunderbird.