Merge many reports in one mail

A customer can have multiple websites. However, when we send Pro Reports by email, each report is sent in a separate email for each website. This means that customers may receive many emails at once.

My idea is to improve this process by allowing the system to send a single email per customer, which would include all the PDF reports for that customer's websites as attachments. This would make the communication much cleaner and more convenient for our customers.