Site_A connects to Site_B over a serviceprovider MPLS network.
Email_Server/Portal_Srv is located in Site_B.
When MPLS is down, site_A cannot access email_Server & Portal_Srv
DNS Entry of Email_Server : 10.1.1.100 & Portal_Srv : 10.1.1.50
Both Email & Portal are published server's on Internet.
Site_A have Internet link but still users cannot access Email & Portal ( local DNS Server resolve names to private range )
If user is outside office campusthen Email and Portal works.
what are my options to make it work.