Thanks Bruce, but is not related to Calendar.
The problem is with Contacts.
In Contacts menu there's not "get CalDAV URLs" like in Calendar section.
I have try to setup a CardDAV account (MacBook OS X 10.11) with this syntax:
username: name.surname@domain.com
pasword: xxxxxxxx
server: http://mail.myserver.com:80/WebDAV/
setup works fine but in contacts I can see only 100 contacts, I can't see the other 2.200 contacts. I can see all the 2.300 contacts only login via web in SmarterMail.
And with this situation if I insert a contact in Apple Address Book I can see this contact in SM web.
If I insert a contact in SM web I can't see in Apple Address Book even if I wait 1 hour (tested).
I Think this is a bug, I have try with different Mac with different server and different SM versions (13.2 - 14.2 - 14.3).
No one works.
Giorgio