The tool has been successfully deployed within our organization for almost 2 years now with no issues noticed so far! It definitely helped us reduce spam mails that were coming into my inbox daily by several hundred per day (from about 2000 emails/mailing list members) over time. I also like how easy it was set up - everything can just run without any hassle. Nothing really bad yet heard but when you're using something new always expect some bugs or problems which will usually get solved pretty fast though sometimes there are more serious concerns where we have had trouble fixing them. We've seen an increase reduction rate while blocking those fake links sent out via email campaigns such as newsletters etc.