What is a username in email format?
The username is the name you choose to be identified with for e-mail purposes and that you have provided to the e-mail host to create your e-mail account. The domain name is the internet designation for the e-mail host, which may be a private site, company, organization, or government entity.
What is an Autogenerated email?
The auto-generated email name function generates an email address with a user name based on a literal concatenated with a sequential number. The sequential numbers are suffixes that begin with 1 and are incremented by 1. The function uses the domain name from an email address in a specified source column.