z-push autodiscover should use the primary hostname for the mail server and not the domain part of the email address (both may work, but the primary hostname is more likely to have a signed SSL cert)

conf/zpush/autodiscover_config.php

@@ -9,7 +9,7 @@
 define('BASE_PATH', dirname($_SERVER['SCRIPT_FILENAME']). '/');
 
 // The Z-Push server location for the autodiscover response
-define('SERVERURL', 'https://' . $_SERVER['SERVER_NAME'] . '/Microsoft-Server-ActiveSync');
+define('SERVERURL', 'https://PRIMARY_HOSTNAME/Microsoft-Server-ActiveSync');
 
 define('USE_FULLEMAIL_FOR_LOGIN', true);
 
@@ -21,4 +21,4 @@ define('LOGUSERLEVEL', LOGLEVEL);
 
 // the backend data provider
 define('BACKEND_PROVIDER', 'BackendCombined');
-?>
+?>

setup/zpush.sh

@@ -63,6 +63,7 @@ cp conf/zpush/backend_caldav.php /usr/local/lib/z-push/backend/caldav/config.php
 # Configure Autodiscover
 rm -f /usr/local/lib/z-push/autodiscover/config.php
 cp conf/zpush/autodiscover_config.php /usr/local/lib/z-push/autodiscover/config.php
+sed -i "s/PRIMARY_HOSTNAME/$PRIMARY_HOSTNAME/" /usr/local/lib/z-push/autodiscover/config.php
 
 # Some directories it will use.