Mail bounce while send groupmail using listserv( mass mailing)
i am new to zimbra. i am using zimbra 6.0 open source. i am facing issue of mail bounce while send it in group using listserv. from last few months it was working fine.while other mails transaction are ok.
I have checked logs too but not found much more. it shows postfix/error 22520.
kindly plz help me.