We are rolling out a change to the domain from which we send out transactional email. Once this change is fully rolled out, all emails from us will originate from support@hackerrankforwork.com. We have started this rollout and this activity should be completed by the end of month (28th Feb, 2015). To be doubly sure that our emails never go to your spam folder, please take a moment to add support@hackerrankforwork.com to your mail program’s whitelist.