Outlook Add-On products

I have a question about add-on products for Outlook. We are trying to setup a process that will delete unwanted email mostly for former employees who neglected to unsubscribe to internet bulletin boards. We get several hundred messages a day. All ofour rejected email is processed through a mailbox called “Post Master”. We have setup rules to delete these unwanted messages, but Outlook can only have 100 rules, and we have gone way beyond that.

We looked at a product called “Exlife” that advertises what we are looking for, but unfortunately it is a one-man shop and doesn’t work.

Does anyone have or recommends any tools that will support our needs? Any assistance you can offer will be greatly appreciated.