I'm successfully using a Barracuda spam filter in conjunction with our 2010 Exchange server. Our MX record and our rDNS record point to mail.domain.com, which is also the Hello response from our Exchange server. Now that the Barracuda is in line and working, it is responding with a Hello of Barracuda.domain.com. I've added an A record for the Barracuda response, and MX Toolbox passes everything, but I'm concerned that eventually they will get black listed because the MX record and rDNS don't match the Hello banner.
I'm considering changed the MX record, and the matching rDNS record, to Barracuda.domain.com. But this has been up and running for a while and I don't want to create an issue where one doesn't exist.
Thoughts please?? Thanks!!