How companies assess your financial risk based only on your email address

Email domain: “The analysis of the email domain can be very powerful, as it allows the understanding of the existing controls around the creation of an email address,” Carvalho tells Quartz. In general, corporate email addresses pose less risk when it comes to online fraud versus email services open to the public, such as Yahoo or Gmail.
Age of email address: Emailage can obtain information about the age of some email addresses. An email address created around the time an order was placed is another red flag for merchants.
Numeric patterns: Patterns in email handles, such as the numbers in John12345, can also be a possible sign of fraud.
Logic patterns: More sophisticated fraudsters use technology to automatically generate email addresses. “The act of creating these addresses often reveals patterns of logic used to create them,” says Carvalho. “We can detect these patterns and identify other email addresses associated with the same fraud ring before fraud happens.”
Email tumbling: Some email addresses, such as those from Gmail, still work when users add special characters, such as a period or plus sign, to the handle. People sometimes use this workaround to create multiple accounts with one email address.

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