DB_CONNECTION=mysql
DB_HOST=127.0.0.1
DB_PORT=3306
DB_DATABASE=[db_name]
DB_USERNAME=[db_user]
DB_PASSWORD=[db_pwd]

....

MAIL_DRIVER=smtp
MAIL_HOST=[the_mail_host] (e.g. smtp.gmail.com for gmail)
MAIL_PORT=587
MAIL_USERNAME=[the_email-address_emails_are_sent_from]
MAIL_PASSWORD=[the_email_account_password]
MAIL_ENCRYPTION=tls