What is required from both the trademark owner and their attorney in terms of email addresses?

The requirement for distinct email addresses for correspondence between the trademark owner and their attorney ensures clear and effective communication throughout the trademark application process. Each party having their own email address minimizes confusion, allows for streamlined communication, and ensures that both the trademark owner and attorney can track their correspondence independently. This setup also helps in maintaining a clear chain of communication and accountability, as each party can send and receive updates and information relevant to the application without overlapping or losing important messages.

The other options don't align with the need for effective communication. Having one shared email address could lead to miscommunication and challenges in tracking who said what. No email addresses would completely hinder the ability to correspond, presenting significant logistical issues in the registration process. A secondary email address may not provide the clarity and directness necessary for ongoing legal matters, as it does not establish clear lines of communication for both parties involved.