"Works like cedar wood."
Thought the Romans in ancient times and used one word — citrus — for cedar (as well as a certain cypress's) wood and for the citron fruit. They all repel moths with their aroma after all. The word itself probably comes from the Greek "kedros" for cedar.
Now, let's find out if citrus fruit in email can ward off wintry gloom as well:
›› Fresh food for your letters. (IncrediMail)