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Error Message: www.postbox-inc could not be found

If you are receiving the following message within the Postbox preview area:

'www.postbox-inc could not be found'

'The browser could not find the host server address for the provided address'

It could be that Comodo Anti-Virus is blocking access through their Host Intrusion Protection System (HIPS), which works similar to a firewall with rulesets, a sandbox mode etc.

To fix this, make Postbox a trusted application in Comodo. Even though you allow Postbox to run via the firewall settings, HIPS settings can override the firewall settings.