on 4/24 our single exchange server started to randomly pop up warnings and errors for event ID 2012 and 2013
SMTP could not connect to any DNS server. Either none are configured, or all are down.
SMTP could not connect to the DNS server 'DNS SERVER IP'. The protocol used was 'UDP'. It may be down or inaccessible.
Everything seems to be running fine. Inbound and outbound email seems to be functioning. The queues have a relatively low amount of messages.
I ran NETDIAG and everything shows success. I ran DNSDIAG for our mail host name and that resolved and passed successfully. I checked the NICs statistics and there are not TCPIP errors or anything like that. I've run DCDIAG on the domain controller(also the DNS server). My SMTP Virtual server does not have any DNS server configured. Only the pri and sec in TCP IP config and I have tested full connectivity to both.
I am stumped. I am still randomly seeing these event IDs.