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Choosing your level of filtering in Zimbra is easy and convenient with XMission's custom filtering zimlet. The filters are designed to filter email using flags added to mail when it is scanned by Spam Assassin. You will have the option of a High or Low level of filtering, or you can turn all filtering off entirely. Jun 30, 2016 · This video explains the installation of Zimbra mail server. It is an open source mail server to send and receive mails. This setup is handled by main agent called Mail Transfer Agent(MTA). For ... You need to block all the SPAM being sent out, whilst its 'quiet' check that the user doesn;t have any forwards set or strange rules that the hacker may have setup. Cleanup any outgoing mail in the queue. Prevent spam problem with Zimbra server. Often Zimbra server is used as relay to send bulk SPAM messages. This can be done if at least one of the accounts on server is compromised. An attacker can use compromised account to login into SMTP server over SSL/TLS and then send SPAM messages.