Task#5819 - Disable block sender feature when no sieve hostname is defined.
Task#5127 - Always sync LDAP to Database contacts
Task#5734 - Fix reload in messages list during message deletion
Task#5913 - Image insertion is always at the end of signature
Task#5939 - Message not opening when selecting a message while another is being loaded
Task#5498 - Method describeTable - Caches database metadata.