Just let me make wildcard entries in the Blocklist. *@... block. this would eliminate half my spam. That's really not hard, I can Blocklist an email sender but I can't manually enter an email to the blocklist... come on.
You can probably expand that to "if not in my contacts" with a text filter that I customize (25% of my spam has a specific name in it, not mine). anything with a URL would eliminate the rest.

Paid user here and now I'm looking at default messaging app...