Until Google will allow me to block whole swaths of IPs in effort to lower spam getting into my Inbox, I don't care much about other upgrades. For few months n

Until Google will allow me to block whole swaths of IPs in effort to lower spam getting into my Inbox, I don't care much about other upgrades. For few months now it seems to me that Sparkpost is a favorite choice of spammers. Perhaps its the low cost or maybe its because they never ever answered to a single spam@sparkpost.com email I send forwarding abusers content. None, zero nada! I can report someone... silence... an then 3 days new letter pops up from a new domain (but same IP) from Sparkpost. That's why I need to be able to block whole IPs.