vxlan configuration between 9600 core switch which is the l3 ip address that connected to 9500 distribution switch in that ospf is enable that connected to l2 switch 9300 that connected to firewall how to configure the vxlan for this.

Hi I don't have email server and smtp server, without this email server how could I configure the mail in the DNAC for alert purpose. could I use public email server instead of private.