I set my user name as Lastname.Firstname, but I receive an error message.

The user name for authentication of sending and receiving mails is a mail address. Please note that the user name requires letters after the @ mark.

The password for authentication of sending and receiving mails is the same as the password for the NagoyaUniversityID.

For instance, when using Mozilla Thunderbird, the user name for Meidai Taro will be meidai.taro@x.mbox.nagoya-u.ac.jp . Therefore, it will be displayed as