We started a REST API called webAdmin that enables an administrator to operate the Apache James server. Using this API, one can manage users, domains, quota, perform basic mailbox, mailRepository and mail queue operations. Much more might come soon!
However, doing rest API calls is a bit cumbersome. It requires reading a documentation, requires typing commands...
We should add a web page (single page application?), also served by webAdmin, that will present, and allow to call the different operations.