Open the message and choose “Convert to task”: pick the project it should land in and the task name. The body of the email becomes the task description.
Once converted, the message shows a “view task” link — so the same email is not converted twice and you never lose track of which work came from it.
This is the shortest path from a customer request to real work: the request does not stay buried in a mailbox, it lands in a project with an owner.