It should be possible to edit the email content before sending emails to customers.

When working with a single order, it would be very useful to add additional text to the mail content. e.g. individual information about products that are not available anymore or additional cargo shipping information, ...

Emails are sent for documents and for status changes. Currently the mail content can not be edited. When sending documents only the mail subject may be updated and the mail content is shown as read only.

When sending status update emails there is no preview of the mail at all.

In Shopware 5 both types of mail could be updated individually before sending to the customer.