Question: What is an email whitelist?
Answer: An email whitelist is a list of email addresses from which an email reader like Outlook or an email blocking program such as Norton Antispam will allow messages to be received regardless of content. These programs are designed to prevent most unsolicited e-mail messages (SPAM) from appearing in your inbox, however these programs are not always perfect. Smart SPAMers can get their emails through these filters if they know the rules. Because of this the email blocking programs tend to be pretty tight so they block the largest percentage of SPAM. If you have someone you wish to not be filtered you can add them to your whitelist. A whitelist is a solution to the filtering so emails are always allowed from a particular person.
In order to use ISN through a heavily secured firewall you must add the following domains to a firewall/proxy whitelist. At some point during the general usage of ISN it will require assets on these domains. Adding these domains to your whitelist will allow users in your network to utilize the Inspection Support Network (ISN):