Starting with version 0.9.8, mu provides an emacs-based e-mail client which uses mu as its back-end: mu4e.
Zimbra Web Client Alternatives
SaaSHub's Down Detector checks the status of services automatically and regularly. However, we cannot promise 100% accuracy. That is why we depend on user reported issues as well. The Zimbra Web Client status here can help you determine if there is a global outage and Zimbra Web Client is down for everyone or it is just you that is experiencing problems. Please always report any issues to help others know the current status.