MS Exchange probleme mit Smartphone

[xxxomxxx 10]

The Exchange ActiveSync user 'xy@organization.ch' has specified an invalid SMTP device address '0794605010' on their device. The user will not be able to receive up-to-date notifications on their device until the correct SMTP address is entered on their device. To fix this problem, tell the user to enter the correct SMTP address on the device and then synchronize the device with their Exchange server using ActiveSync.

 

das ist die fehlermeldung die ich bekomme, wenn ein user ein Smartphone synchronisiert, ob via active sync am client oder active sync via GPRS spielt dabei keine rolle...

 

wie kann ich dies beheben?

 

danke