ISS does NOT support accessing your Blake email (Gmail) through 3rd party client software such as Apple's Mac Mail, Apple iOS Mail, Android Mail, Microsoft Outlook, Thunderbird, Windows Mail and other stand along email clients.
ISS only supports the web interface of Gmail. Visit: http://gmail.blakeschool.org
If you would like to configure your 3rd party client software, Google provides documentation on how to do so. Just be sure to use your Blake email and password credentials. (However, if you run into any difficulty, ISS will not be able to support your 3rd party client.)
To learn how to configure your software please visit: Google Gmail Online Help - Get started with IMAP and POP3