Answer
GMS started to send email to the remote server using Enhanced SMTP when the remote server said that it already had part of the message and only the additional part needs to be delivered. For example, the remote server already has 9MB of a 10MB message so GMS only needs to deliver the last 1MB of the message. This is a substantial saving in bandwidth!
In this case, session Undefined was was processing a message to be delivered to the Undefined (IP address Undefined). The local folder name is Undefined and the remote server has Undefined bytes of this message already.
This is the correct result, no action is required by you.
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Keywords:RESTART CHECKPOINT POST sending bandwidth reduction 8369