Anonymous FTP Options
secure_email_list_enable

Set to YES if you want only a specified list of e-mail passwords for anonymous logins to be accepted.

This is useful as a low-hassle way of restricting access to low-security content without needing virtual users. When enabled, anonymous logins are prevented unless the password provided is listed in the file specified by the email_password_file setting.

The file format is one password per line, no extra whitespace. The default filename is /etc/vsftpd.email_passwords.

default=NO