The Data Masking transformation returns an email address of random characters when it masks an email address.
For example, the Data Masking transformation can mask
When you use the email masking format, you must set the seed value. The seed value is a random number from 1 through 999 and is a starting point to generate masked values. You can enter a different seed value. Apply the same seed value to a column to return the same masked data values in different source data. For example, you have the same Cust_ID column in four tables. You want all of them to output the same masked values. Set all four columns to the same seed value.