Some messages are rejected by MTA also stay with (Processing Status) and Recipient (None)
Rejected Message by MTA
None to Recipients
These entries in the Message Audit Logs occur when a message transaction is completed before any processing is done.
For example, if a message size is larger than the maximum allowable size configured, it will be rejected by the MTA before the contents of the message are processed; "(Processing Status)" and "None" will be logged in most fields of the Message Audit Logs.
This is by design for transactions that do not gather enough information from a message to complete these fields.