Exch 5.5 enviroment, there are 3 or 4 domains with no obvious relationship to each other that are not going out of the queue.
it is getting a [HOST UNREACHABLE] near the recipient name in the properties of the message.
the only event (may or may not be related to the problem) that is logging consistantly is an event 5774 with these details:
Event Type: Error
Event Source: NETLOGON
Event Category: None
Event ID: 5774
Time: 9:49:07 AM
Registration of the DNS record '53202d1c-a16f-408b-a24b-270922235097._msdcs.XXXgroup.local. 600 IN CNAME exchange.XXXgroup.local.' failed with the following error:
DNS RR set that ought to exist, does not exist.
0000: 30 23 00 00 0#..
this server has been running for like 8 years, we never have these problems, just recently in the last few weeks this is happening...
also, it is only a few domains (not popular ones like yahoo or aol.com, but definitely legit ones.)
i spoke to the admins from a few of these companies and they are not blocking us, it seems like the server wont even recognize the address as legit.
let me know if i can give any more helpful details to get this resolved...
anyone run into this, PLEASE HELP!