Hi there, There is nothing preventing you from having all 120 domains in the configuration file on the new appliance, and redirecting Mail Exchanger records 5 domains at a time when you're ready. I would recommend to cluster the old and the new appl...

Hi Bob, You're correct, the answer is No.  In general, there are very few similarities between a forward proxy and reverse proxy functionality (other than HTTP/S proxying itself), it's like trying to build a sports car and an offroad vehicle in one...