The user account which was used to submit this request does not have the right to send mail on behalf of the specified sending account: this is the error message with code 19721.

Some information:

- My device: MacBook Air

- OS X: Mavericks 10.9.1

- Outlook 2011 for Mac: latest installed updated: 14.3.9 

- Account: Exchange (server Exchange 2013)

The Outlook synchronize folders, including In Box. I can delete, move to folder, edit contacts and calendar. The same account is configured at an iPad, iPhone and tested at Outlook 2013 for Windows pc and all those devices can send messages.

The Outlook was running last 2 months: no problems for send until last monday (I'm not sure, but I think after the last OSX up date).

At my Mac I tried:

- delete the account and setup again;

- uninstall the Outlook and reinstall again;

- uninstall the Safari and reinstall again (it was a tip at a specialized forum);

- format HD, install the OSX and Outlook 2011.

I have no idea what can I do now? It is so important for me, because using Mac the only option I have now to send messages is using OWA. I need this for work, I will appreciate any help. Thanks so much.