MailinBlack is a very good anti-spam software for my office that protects me from being hacked online. I am able to manage messages from other offices using this service. The customer support team are fantastic, they are helpful and quick to respond to any queries or concerns that we may have. I would like to see more options to filter out messages, as it doesn't always work perfectly when filtering. Be sure that you understand what type of data you are sending via your webmail and that the firewall/antivirus software that you use can cope with the extra traffic. We're solving our spam problem by blocking unwanted messages coming into my inbox and allowing access only to those that are necessary. It is very easy to use, it's quick to set up and easy to manage. There are no downsides as I have not found any so far. The interface is also very intuitive. I'm using the free version which is sufficient for our needs. We're protecting emails from spam and phishing attacks. This helps us to stay secure online and prevent data loss.