In an effort to keep phpbb clean and free of spam, a number of spam protection services have been developed. These services work to identify and remove spam posts from the phpbb forums. In addition, they also provide tools to help users report and block spam posts.
There are a few different types of spam protection services available for phpbb, but the most popular is probably the Spam-O-Matic service. This service works by automatically identifying and then deleting spam posts from your forum.
There are a variety of spam protection services available for phpbb, each with its own advantages and disadvantages. No single service is perfect, but by using a combination of several services, you can significantly reduce the amount of spam on your phpbb forum.