A message was sent to a list for posting to all the list members. The message was rejected because it had multiple TO: clauses and may therefore be unsolicited commercial email. The default limit for the number of To addresses a message can contain is 5, but this may be changed by the list administrator.
In this case, request Undefined was going to post a message to list Undefined.
This is the correct result, no action is required by you.
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Keywords:post spam UCE protection multiple addresses 8463