We have written on this blog before about the importance of email deliverability and what we do to ensure your emails reach their recipients. Spam filters implemented by different email clients (Gmail, Yahoo, Hotmail, etc.) are becoming increasingly sensitive, to make sure that non-legitimate, spam emails aren’t delivered. Ensuring emails are delivered to the inbox is pretty much guaranteed if your list members have 'whitelisted’ you. This means, simply, that you (as the sender) have been added to their list of 'approved’ or 'safe senders’. Different email clients carry out the whitelisting process in different ways and use different terminology. In this short post, we explain how to whitelist email addresses in Gmail.