Contact Error under AirSync -

Under synchronization EM Client indicate ERROR IN E-MAIL - Not Supported format but don´t indicate field with problem.
Sync - account
Verifying all E-Mails don´t locate error in E-Mail address.
I request include a tool contact to verify error in database.
Please help to solve this problem
Last version EM Client - 8.0.2751 (64c614a)