[NiceToHave] Provide a IMAP/JMAP ui for Apache James for demo

[ieugen]

It would be nice to have a UI setup with the instance to allow us to demo it easily.
Looking for a nice IMAP or better, a JMAP web app that

Deployment should be in another Docker container.

[chibenwa]

As part of our work at Linagora we uses Apache James as an email server backing OpenPaaS. Unified Inbox component offers a JMAP (draft) User Interface. Dockerfiles can be found here: https://github.com/linagora/openpaas-esn/tree/master/docker

(I am not sure it is minimal nor fit your needs but if it can help...)