Dock net net mail

It seems like you're trying to communicate something, but the words "dock net net mail" don't quite make sense. Could you please provide more context or clarify what you're trying to say?

Are you perhaps referring to a specific topic, such as:

• A dock (a structure for boats) and a net (a mesh fabric) and mail (a system for sending letters)?
• A dock (a platform for loading/unloading cargo) and a net (a financial network) and mail (electronic communication)?
• Something entirely different?

Please feel free to provide more information, and I'll do my best to help you out!