It would seem like an API I wanna use is blocking my hosters IP range.

GAME ON FUCKERS!

Had that happen when debugging a payment gateway for a customer once. Fun times.

I have it fairly often with my hoster's IP range unfortunately... Takes quite some effort to clean the IP addresses that you happen to be using.. with the expectation that the one that comes next will kill all of it anyway by spamming the shit out of it.. because people are that nice. I've been seriously considering to just migrate my mail server cluster to Hetzner instead. Apparently they ask for ID verification, so spammers should be repelled by that. And cost-wise, it's pretty much the same.. just no HA from a multi-host configuration.. meh.