The SMTP Remote senders report is showing thousands of '<>' senders
I bet once SMTP AUTH is done, no more filtering is applied to the session's traffic. The whole point of SMTP AUTH is that you trust the IP, so why filter? The only filtering would be virus scanning, but not from/to/content filtering.
Can't your reporting show traffic per IP? so you can see if the null sender traffic is from one IP (abuse) or from many IPs?
Len
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