Top senders and recipients
Remove "spam email addresses" (or non-existing email addresses) from the "Top senders and recipients" report. It currently show several non-existing (and never existed) email addresses for my organisation.
I would imagine that organisations with more spam would find the result utterly useless. I can still navigate around the spam listings, but it is still a nuisance.
S. Porter commented
In our environment, we were able to catch some compromised user accounts using tracking logs for addresses that did not exist in exchange- example - email@example.com was a real account, but firstname.lastname@example.org was not- and so we would see messages in logs from email@example.com - and it turned out that someone had gotten the pw for msmith and was using his credentials to authenticate and then send spam from a nonexistant account.