Please can someone shed some light on this problem for me. I cant find anything on these errors in the knowledgebase. Im running exchange server 5.5 SP3. I have a number of domains that my exchange server handles - approx 10. I have no idea of who this message is trying to be sent to only who is sending it.<br>What Im trying to find out is what causes this error and why.<br>Any ideas?<br><br>12071<br>Message <x> with subject 'x' from 'x' exceeded the maximum hop count<br><br>4098<br>The following message could not be delivered because the hop count exceeded the maximum. Check your configuration to make sure messages are not looping.