hello, from the morning today I have a problem with the exchange server 2007
in the first when I'm sent a message to yahoo or Hotmail a message was successful, after 1 min trying again show to me
A problem occurred during the delivery of this message. Microsoft Exchange will not try to redeliver this message for you. Please try resending this message later, or provide the following diagnostic text to your system administrator
and the error is
#554 5.4.4 SMTPSEND.DNS.MxLoopback; DNS records for this domain are configured in a loop ##