A list of words that are not included to determine whether a message is spam. The words in the exclude list are words that have an equal chance of being non-spam as spam. For example, "Mortgage" is a term frequently used in spam. However, if you work in the financial industry, this term may appear frequently as non-spam. In such a case, you can enter the word "mortgage" into the exclude list. The exclude list should also include common words like proper names. The exclude list is stored in the exclude-list.txt file located in the mail domain 's directory.