Answer
GMS is in the process of delivering an email to a remote address. To do this, it needs to resolve the Mail Exchange (MX) records so that it knows the IP address of the mail server to deliver the message to. Either the MX resolution failed or returned a FQDN which needs further resolution. In this case, the additional resolution has failed.
In this case session Undefined attempted to resolve the hostname "Undefined". A resolver error code of Undefined was returned.
In order to resolve this issue, check the articles on DNS error codes (KB0796 listed below).
See Also:
- What are the error codes produced by DNS resolution?
- Do you have a list of the available winsock errors?
- How do alerts work?
- What are common DNS configuration issues?
- What is an MX record?
- What is a FQDN?
Keywords:resolve DNS failure 8269