Have a site to site tunnel between routers and the mail between the sites won't flow both are exchange servers in the same routing group. I have to tunnel between the sites wide open IP and still nothing.
Re: Site to Site VPN Mail between sites not flowing
Do you have ACL in the interface where VPN use to establish connection? Try removing the interface ACL, if it works, add the IP Address of the VPN to the permit entries of the interface ACL, re-apply the ACL to the interface.
We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...