I didn’t like Avast because it didn’t block that many dodgy links - not as many as Norton, Bitdefender and Trend. On Windows it blocks them, Web Shield probably supports heuristics that inspect the page content. But relying just on its blacklist it doesn’t block a lot. Vodafone here in the UK uses the Avast base for its Secure Net and it rarely blocks something too.
My inbox is always overflowing with junk and this is what I use to test 
