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Currently there is no function to confirm the response rate of the reply mail to the mail sent in the campaign easily, like view or report.
(*e.g. Response rate : If you send 100 mails and 50 reply, reply rate 50%)

According to the following Dynamics Community, it seems that user could confirm the response rate in the report by customizing the system.

Title : [CRM 365]. Campaign Responses
URL : https://community.dynamics.com/crm/f/117/t/256907

It would be more convenient if there is a default function that can allow users to check without customization.
Category: Email
STATUS DETAILS
Declined
Ideas Administrator

Thank you for reaching out. Your suggestion seems to be a unrelated to Dynamics Customer Service. Please resubmit your idea to appropriate Dynamics 365 Application ideas forum.   

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Dynamics Customer Service Team