No specific info about version 4.5. Please visit the main page of Mail on Mac Informer.
Info updated on:
With Stationary for Mail you can stop searching for great-looking Mail stationery!
It can forward mail from AOL, Gmail, Hotmail, MSN, etc. to any e-mail address.
Brings the comfort of your webmail in your desktop.
Mail Stationery Designs will give you great-looking e-mails.
Mail conversion software to convert Apple Mail mailbox to PST format.