In Workspace > Reports > Thank You Emails, locate the thank you message and click View in the Email Content column.

In Google Chrome,

a) click somewhere in the content of the email and use Ctrl+A to select all of the email text.

b) then right-click and select Print...

c) Select the Destination: a printer, Save as PDF, etc.

In Firefox, right-click in the email body and select This Frame > Print Frame... and select the Destination.

The email can also be resent by clicking the Re-Send button.