The graphs of checked mail are of mail transactions instead of addressees; a single message addressed to 1 or 1000 people is counted as 1. Mail messages with total target counts larger than 10 are bulk and so likely spam. Messages with target counts of millions or "many" have been declared spam by at least one target DCC client. Such messages are trapped spam because they have usually been sent to "spam traps," or addresses targeted only by spam.
The Spam Ratios are of likely spam and trapped spam to the total number of messages. DCC client programs can reject or discard bulk mail that is likely spam as well as trapped spam.
