I have a Local Exchange Server 2010 (remote.benchmarkerie.com), which has an A and MX record pointing to it at my GoDaddy domain, benchmarkerie.com. We are getting sporadic send errors (bounce backs) to various domains. It doesn't happen all the time and there seems to be no rhyme or reason. I have a Cisco UC320 at the edge with ports 25 and 587 opened to the local server (192.x.x.x address). Any thoughts? Thanks in advance.