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Step 2: Set DNS

  1. Verify if Zimbra server connects successfully to Vaultastic connector on port 25.

    To confirm the connectivity, use the Telnet command as mentioned below.


    telnet o365-v4.vaultastic.com 25



  2. On successful connection to the Vaultastic server, you will receive a message as shown below


    Connected to o365-v4.vaultastic.com.
    Escape character is ‘^]’.
    220 archive ESMTP Postfix-VaultasticConnector



  3. If you could not connect to Vaultastic server successfully, an error message will be displayed on the screen as shown below

    o365-v4.vaultastic.com: Unknown host



  4. Possible causes are

    • The DNS Lookups option is disabled. The DNS Lookups option is displayed under the MTA tab of the admin console or with zmprov.

    • DNS service is missing on Zimbra server


    In above cases, Zimbra uses /etc/hosts, based on the entries on the “hosts” line in /etc/nsswitch.conf file

    To resolve this add DNS entry for Vaultastic in the /etc/hosts file.

    Open the /etc/hosts file and enter the IP address of Vaultastic server as mentioned below

    {ip of vaultastic o365-v4.vaultastic.com} {domainprefix}.vaultastic.com

    To find out the IP address of Vaultastic server,

    • Go to the site http://mxtoolbox.com/DNSLookup.aspx

    • Type o365-v4.vaultastic.com in the DNS Lookup box.