"Superhuman" was a brand and product known for its email client, which aimed to provide users with what they claimed to be "The Fastest Email Experience Ever Made." Please note that the details of brand campaigns and product offerings did have evolved since then, so I'll provide information based on what was known up to that point.

Superhuman's brand campaign revolved around positioning its email client as a revolutionary tool for professionals who rely heavily on email communication. Here are the key elements and messages associated with the campaign:

1. Speed and Efficiency: The central theme of the campaign was speed. Superhuman marketed itself as the fastest email client available. They emphasized features such as instant email search, quick email loading, and keyboard shortcuts to help users manage their emails with lightning speed.

2. Productivity: Superhuman aimed to enhance users' productivity by streamlining their email workflows. It offered features like automatic email categorization, customizable keyboard shortcuts, and email tracking to help users manage their inboxes more effectively.

3. Exclusivity: Superhuman positioned itself as a premium email client with a waiting list for access. This exclusivity added an element of desirability to the brand, making it feel like a status symbol among professionals.

4. Personalization: The campaign highlighted Superhuman's ability to adapt to individual users' preferences and habits. It offered features that learned from user behavior to provide a tailored email experience.

5. User Experience: Superhuman's user interface and design were a key part of the campaign. The brand emphasized the clean, minimalist, and intuitive design of its email client, which made it easy for users to navigate and manage their emails.

6. Security: While speed and efficiency were paramount, Superhuman also emphasized its commitment to security and privacy, addressing concerns that users might have about a third-party email client.

7. Word of Mouth: Superhuman encouraged word-of-mouth marketing by offering users incentives to refer others to join the platform. This helped the brand grow its user base through recommendations from satisfied users.