CardDAV & CalDAV
With servermx.com you have SOGo (www.sogo.nu) which supports CalDAV and CardDAV.
CardDAV and CalDAV enable to access online contact and calendar information.
Android can be easily configured to synchronize your Calendar/Address Book with your servermx.com Email account
How to set up CalDAV, CardDAV for Android
SOGo 2 configuration
SOGo 5 configuration
set protocol SSL with your username and password.
For android can be used the following clients CalDAV and CarDAV
ContactSync - CardDAV and more
This app works fine with sogo5 and sogo2. ContactSync is an Android app which allows you to sync your Android contacts with CardDAV, FTP, HTTP, WebDAV servers, Cloudstorage, or local files (stored on the device or e.g. as a mail attachment) (CalDAV).
DAVx⁵ – CalDAV/CardDAV Client
This is an all-in-one synchronization solution for both contacts (CardDAV) and calendars (CalDAV).