Step 2: Set DNS

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.