In Edge Exchange 2010 we have some queues with this error: 451 4.4.0 "dns query failed". I know that those domains exists. Also, If I manually check DNS resolution, I can find MX records..
Edge server have 2 NIC. Internal NIC uses internal DNS Servers, External NIC uses external DNS Servers.
I've seen some forum, I've checked these things:
- Configure external connector to use External DNS lookup >>> It didn't solve the problem
- Execute "dnscmd /config /enableednsprobes 0" in internal DNS Servers >>> It didn't solve the problem