We are currently evaluating the WSO2 Identity server. We want to use email address as an username. By default the username is 30 characters, it is not long enough. And it mu
Here's the official doc on this: https://docs.wso2.com/display/IS500/Email+Authentication
By default '@' is interpreted as a special character to build full qualified usernames for multi-tenant environments. So you'll need to configure the server to interpret otherwise.