Is the zentyal log showing errors like this :
2013/12/19 21:05:34 ERROR> GlobalImpl.pm:654 EBox::GlobalImpl::saveAllModules - Failed to save changes in module mail: LDAP error: Some part of the request contained an invalid syntax. It could be a search
with an invalid filter or a request to modify the schema and the given
schema has a bad syntax.
.<br/> Operation parameters:{
'attr' => [
'domainComponent',
'rapheal.no-ip.com',
'objectclass',
'domain',
'objectclass',
'vdeboxmail'
]
}