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Public IP changed now cannot send email from sbs to one client other email wrks

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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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