Mailgun setup with Laravel 5

When we are configuring email with mail gun account with our domain name .In .env file what does it mean MAIL_USERNAME ?? is it the email address or SMTP login name from mail gun account. ?

MAIL_DRIVER=mailgun
MAIL_HOST=smtp.mailgun.org
MAIL_PORT=587
MAIL_USERNAME=*******
MAIL_PASSWORD=****
MAIL_ENCRYPTION=tls

In my .env file i have added MAIL_Username as postmaster@domain.com which i have gotten from mail gun account ? is this correct way of doing ?can anyone confirm on this ?

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