Hopefully this is a nice and easy simple question for somebody
Have the following setup
AD_Site_A
EX1 and EDGE Server
AD_Site_B
EX2 HUB
AD_Site_C
EX3
AD_Site_A - can send outbound mail through Edge role
Do I need an Edge Server, or Edge subscription for the Exchange servers in Site_B and Site_C ?
if i disable the hub server, will mail fail in Sites_B and C