I have a legacy Local Deny List with over 3,000 entries on it.
Any suggestions on how to review the entries [automatically] to see if they are harmful or spam site?
I am tempted to just drop all 3,000 entries and start from scratch -- assuming that Trusted Source will protect me in most cases.
Unfortunately we do not have any kind of tool that would quickly process through the ip list.
I am guessing that you probably have end-user spam reporting turned on for a list that size?
I think the list was built "many" years ago when IronMail was first developed by Ciphertrust, and it was passed along during each upgrade/replacement (Early 2000's)
No, the end users did not report those addresses.