I have a client running SBS2011 with exchange 2010.
When they send to one particular email address the message stay in the queue viewer with the following error "418.104.22.168 Primary Target IP Address responded with "522.214.171.124 Dynamic IP Addresses are blocked. Please contact your email provider"
I have search the web but cannot find this exact error. Can anyone advise what this error is caused by.
Thanks and kind rergards,