This risk check initiates when the number of email addresses a ShopperDNA Shopper has used in the configured timeframe exceeds the specified threshold.
It is common practice for fraudsters to cycle through lists of email addresses in an attempt to appear to be separate, legitimate users. This check is aimed at identifying users whose email address diversity fits the profile of a fraudster.
Merchants can establish a threshold for both the number of unique email addresses and the timeframe allowed. The default is 3 times over 3 days.
The risk check fires on the transaction after the set threshold. So, if a merchant sets a threshold of 3 in 30 days, it fires on the 4th email address recorded in that 30-day period.