@Sanjeev yes, or you can add it from the web interface !
Anyway, no error about Kerberos anymore, but on my side, i'm not able to get the ticket created from the mailbox... But it's another story !

Hi @Sanjeev

Thanks it was helpfull for me !!!
I would suggest to only append , NULL, 1, array('DISABLE_AUTHENTICATOR' => 'GSSAPI'));
to the existing value and modify if necessary the username/password/url directly in the uvdesk_mailbox.yaml config file.