We are acquiring a business and early this week something happened to the existing Public IP. We assigned the new Public IP to the site which is using SBS 2011. There were a few hiccups but the major one I am experiencing right now is that I can send and receive all email except from our company. I can send from my email but they cannot send back to us. They get a delivery delayed message. I need help figuring this out. The MX record is correct, we are running exchange 2010 thru a McAfee appliance. I do not know if the issue is on our end or the other end.
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