Answer
A message was sent to a list for posting to all the list members. The message was rejected because it has been sent from a null or empty address. Such messages are usually automatic responses or spam.
In this case, request Undefined was going to post a message from Undefined to all the members of the list Undefined.
This is the correct result, no action is required by you.
See Also:
- How do I setup and run a discussion?
- How do a configure a list for delivering newsletters?
- How do alerts work?
Keywords:post empty address null 8449