I have a client that from time to time will have DNS resolution problems related to mail routing- it will look up the MX record for the domains, and try the different hostnames it comes up with in succession, then (out of desperation perhaps), it trys to connect to the domain itself (aol.com for example), though this is not a valid A record for one of the recipient’s mail servers. Then after the mail delivery timeout, it gives the sender a Delivery Failure notice.
Restarting the router “restart task router” fixes it temporarily but it still comes back eventually (maybe a few weeks later). How can I fix this permanently without restarting the router task after I start hearing complaints?
Subject: RE: You might want to check IBM Tech Note 1095041
Thanks, Craig. Both very helpful. For others with similar issues, I found these two links off of the ones you posted which also provided some very good info on troubleshooting SMTP/Router delivery issues: