What are the different types of contacts in SendFox?

• New contacts are contacts that have been recently added into your SendFox account but haven't engaged yet. A subscriber is considered new until they've been sent an email and/or taken action on a campaign. If they open/click an email within 60 days of the first send they are considered an active contact. If they do nothing they are considered an inactive contact. 
• Active contacts are contacts that have opened a campaign in the last 6 months (180 days). 
• Inactive contacts are defined as contacts which haven't opened a campaign in the last 6 months (180 days).
• Invalid contacts are contacts which SendFox has determined are a no-go for sending. This includes contacts which we have a record of bouncing in the past, or the address/server doesn't exist.