i am using zimbra community version. i want to single user relay access, the another can not relay access. Must be just one user has relay access to another mail servers.

is it possible ?

my smtpd settings:
zimbraMtaAuthEnabled: TRUE
zimbraMtaAuthHost: zimbra.studyo5.local
zimbraMtaAuthTarget: TRUE
zimbraMtaAuthURL: https://zimbra.studyo5.local:443/service/soap/
zimbraMtaSaslAuthEnable: yes
zimbraMtaTlsAuthOnly: TRUE
zimbraShareNotificationMtaAuthRequired: FALSE

thank you.