yes once and it was a non tls, i used forwarding mode.

they changed the cost from 10 to 40 for the barracuda and the NP for email had a cost of 10.

i put in the ip address of the barracuda in the ip address box and disabled mxlookup i believe...

it all worked it was a simple seltup...make sure that opportunistic tls isnt enabledd in exchange.