I am not an attorney, if one is present please do speak up. Here is a summary from the Burea of Consumer Protection - Business Center (a .gov site). My question to you is - can you tell me where in the CAN-SPAM Act it says, given one follows the below guidelines, one cannot send mass emails to unsolicited email addresses? It looks to me like you can if your email has no "commercial content" and even with "commercial content" you can email unsolicited email addresses so long as you observe the following. Here is the quote and here is the link: http://business.ftc.gov/documents/bus61-can-spam-act-compliance-guide-business More Q&A on the site linked to above.