What action can a supplier NOT take regarding the RFP notification email?

The action that a supplier cannot take regarding the RFP notification email is marking it as complete.

This is because marking an RFP as complete typically refers to the internal processes of the supplier rather than an action that can be performed directly through the RFP notification email. The RFP notification email primarily serves as a communication tool that informs the supplier about the RFP and prompts tasks such as downloading the RFP document, submitting proposals, or managing their responses.

In contrast, actions like downloading the RFP PDF, withdrawing a proposal, and forwarding the RFP are tangible interactions that can be performed directly related to the RFP process. Therefore, the ability to mark an RFP as complete is not applicable to the functionalities available within the notification email context.