For our current Anti-Spam process we use CleanTalk Anti-Spam a cloud service protection for websites.
This plugin uses protection methods that are invisible to site visitors.
The main function of CleanTalk plugin is to provide a reliable tool for protecting our web site against spam and spambots. Invisible to the visitors, simple and convenient for our administrators, CleanTalk blocks 99,998% of the spam no other data is collected. Thanks to its capabilities its abilities surpasses anything we tried for accuracy of spam detection.The system also provides a report about the work of the service and stores 45 days of data.
View a video about this product. https://youtu.be/XR8-U8YYmRo
Go to the website : https://cleantalk.org/
It took 5 minutes to install and it really works well without any problems.
We are also happy with the after sales support.
I recommend this product for being helpful in spam elimination to your website.
Wire Antennas UK