I am impressed with the tool's discovery capabilities which help me find out who is sending the emails on the company's behalf. I also find the ability to detect and generate reports on phishing emails a valuable feature. 

What we find the most valuable is Brand protection. It's very good and it does what it says. 

It's easy to use.

It comes with a lot of helpful tips for complicated areas.

If spam or some kind of malicious email gets past Mimecast and gets into our email environment, we can go into Agari and we can search for it. We can actually enforce it and rip it out of the user's mailbox.

If we get a false-positive, there's an actual way we can kind of align the email that comes in. A lot of times we'll get an alert saying we received a package delivery from UPS or Amazon, for example. For some reason, that might get flagged as suspicious, but if we look at the email closely, we'll realize it's coming from a legitimate source. We can actually go into the email in tracking and use a "fix button", or something, and then we can add it to a bypass list. From there, we can actually add some comments and notes in there so we don't get that again.

Agari offers very good brand protection and they are the core founder of the DMARC standard.