Empty subject for some mails after 2.3.8 update


after updating to z-push 2.3.8 some mails arrive on iPhone with empty subject. Most of this mails came from German Kopano support and contains one or more “Umlaute” in subject.

Please see this iOS 10.3.3 screen shot:
Missing subject marked with red arrow.

I see this issue only with z-push. Viewing the mails with WebApp, subject is OK.

Environment: iOS 10.3.3 or iOS 11.0.1, Kopano core: 8.3.4, SLES 12 SP2.

German Kopano support is unable to duplicate this issue.

Any ideas how to solve this issue?


Hello @walterhof ,

Can you provide a xbxml log of when such an email is synced to the mobile device?


open incident [KS-38796] contains a WBXML-log.


Hi @walterhof ,

Then why are you posting here, when you already have a support ticket open?