I often receive spam messages coming from different numbers every time so blacklisting specific numbers isn't very helpful. But basically they have common words in them ("condo unit for sale", "bank loan", etc.) so it would really be fantastic if the app can block or store in a spam folder those that contain words that the users do not wish to deal with. It's the one feature in the default android messenger that i love, but that was too slow so i switched to textra.