According to a new study from Return Path, monitoring 500,000 campaigns from its Mailbox Monitor service from January to June 2009, the average inbox placement rate for permissioned, commercial email in the US and Canada was 79.3%. Of the nearly 21% of email that is not delivered to the inbox just 3.3% is sent to a "junk" or "bulk" email folder and 17.4% is not delivered at all.