Nonexistent, invalid, or fake email addresses, which aren’t connected to existing business domain names, can spell trouble for organizations when used as part of a site’s registration process or in an online contact form.
Such addresses can be the product of human error. For example, users may inadvertently mistype their email addresses by omitting, adding, or switching one or more characters or words. However, using nonexistent email addresses can also be deliberate for different reasons that include: