biglebowski
Technical User
I have just migrated from SBS 2003 to SBS 2008 and now intermittently we are getting delayed delivery messages. They seem to be for the same destination domains but do not happen all the time. If left the messages will eventually be received at the destination but can take up to 24 hrs. It is only affecting outgoing messages. I've had a look at the MS technote for the error but this didn't help.
451 4.4.0 DNS Query Failed
451 4.4.0 DNS Query Failed