[header] How to prevent unsolicited commercial email [title] Recognize unsolicited commercial emails. [substeps] Such emails often have topics that are tailored to gain your curiosity. For example, it may indicate that it has a joke about a well-known figure or that action is required on your part. 
These emails typically come from people or businesses that you do not know. Such emails may identify the sender as having a common name, such as joe.