Step 2: Add DNS Entry of Vaultastic in Zimbra

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

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

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

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.