How to prevent gift cards from going into spam?

How to configure email servers to prevent Gift card emails from going to spam.

Most gift card emails will come from the email "noreply@tangocard.com". If you are not receiving these emails first check or your junk mail folder or follow this link to 'whitelist' this email as well. 

We also recommend to whitelist the following domains:

'tangocard.com'

'bhn.com'

'blackhawknetwork.com'

'xoxoday.com'

'tremendous.com'