1. ‘Reaction to the DEC Spam of 1978’. Brad Templeton, blog; www.templetons.com/brad/spamreact.html#reaction accessed June 2019
2. Adam Hartley ‘Spam gets 1 response per 12,500,000 emails’;
10 Nov 2008:
TechRadar>
www.techradar.com/news/Internet/computing/spam-gets-1-response-per-12-500-000-emails-483381 accessed June 2019
3. Emily Bauer ‘15 outrageous email spam statistics that still ring true in 2018’;
1 Feb 2018:
Propeller>
www.propellercrm.com/blog/email-spam-statistics accessed June 2019