I have 3 sites, let me call Site1 , site2 and site3. where Site 1 is holding the primary mx record for receiving the
emails from external world.
Problem is when tunnel breaks between site1 and site3 all emails to be delivered to site3 are stuck in site1 itself,Expected
to use alternate way that's is from site1 to site2 and from site2 to site3 where the tunnels are up in running and delivery the emails.