RandomEmail

Generate email addresses for a specified column.

Parameters

Name	Description	Default	Required	Supported DB types
column	The name of the column to be affected		Yes	text, varchar
keep_original_domain	Keep original of the original address	false	No	-
local_part_template	The template for local part of email		No	-
domain_part_template	The template for domain part of email		No	-
domains	List of domains for new email	["gmail.com", "yahoo.com", "outlook.com", "hotmail.com", "aol.com", "icloud.com", "mail.com", "zoho.com", "yandex.com", "protonmail.com", "gmx.com", "fastmail.com"]	No	-
validate	Validate generated email if using template	false	No	-
max_random_length	Max length of randomly generated part of the email	32	No	-
keep_null	Indicates whether NULL values should be preserved	false	No	-
engine	The engine used for generating the values [random, hash]. Use hash for deterministic generation	random	No	-

Description

The RandomEmail transformer generates random email addresses for the specified database column. By default, the transformer generates random email addresses with a maximum length of 32 characters. The keep_original_domain parameter allows you to preserve the original domain part of the email address. The local_part_template and domain_part_template parameters enable you to specify templates for the local and domain parts of the email address, respectively. If the validate parameter is set to true, the transformer will validate the generated email addresses against the specified templates. The keep_null parameter allows you to preserve existing NULL values in the column.

The engine parameter allows you to choose between random and hash engines for generating values. Read more about the engines in the Transformation engines section.

Templates parameters

In each template you have access to the columns of the table by using the {{ .column_name }} syntax. Note that all values are strings. For example, you can use for assembling the email address by accessing to first_name and last_name columns {{ .first_name | lower }}.{{ .last_name | lower }}.

The transformer always generates random sequences for the email, and you can use it by accessing the {{ .random_string }} variable. For example, we can add random string in the end of local part {{ .first_name | lower }}.{{ .last_name | lower }}.{{ .random_string }}.

Read more about template function Template functions.

Random email generation using first name and last name

In this example, the RandomEmail transformer generates random email addresses for the email column in the account table. The transformer generates email addresses using the first_name and last_name columns as the local part of the email address and adds a random string to the end of the local part with length 10 characters. The original domain part of the email address is preserved.

CREATE TABLE account
(
    id         SERIAL PRIMARY KEY,
    gender     VARCHAR(1) NOT NULL,
    email      TEXT       NOT NULL NOT NULL UNIQUE,
    first_name TEXT       NOT NULL,
    last_name  TEXT       NOT NULL,
    birth_date DATE,
    created_at TIMESTAMP  NOT NULL DEFAULT NOW()
);

INSERT INTO account (first_name, gender, last_name, birth_date, email)
VALUES ('John', 'M', 'Smith', '1980-01-01', 'john.smith@gmail.com');

RandomEmail transformer example

- schema: "public"
  name: "account"
  transformers:
    - name: "RandomEmail"
      params:
        column: "email"
        engine: "hash"
        keep_original_domain: true
        local_part_template: "{{ first_name | lower }}.{{ last_name | lower }}.{{ .random_string | trunc 10 }}"

Result:

Column	OriginalValue	TransformedValue
email	john.smith@gmail.com	john.smith.a075d99e2d@gmail.com

Simple random email generation

In this example, the RandomEmail transformer generates random email addresses for the email column in the account table. The transformer generates random email addresses with a maximum length of 10 characters.

RandomEmail transformer example

- schema: "public"
  name: "account"
  transformers:
    - name: "RandomEmail"
      params:
        column: "email"
        max_random_length: 10

Result:

Column	OriginalValue	TransformedValue
email	john.smith@gmail.com	john.smith.a075d99e2d@gmail.com