What kind of server do you have and which location? This only applies (as far as I’m told in the email) to servers ordered through their auction. I received this email at 13:15 CET.
I also haven't received one. Checked spam too. My server is a 61 EUR/mo, and is a Xeon E5-1650v3 with 256GB RAM. It was only provisioned a few weeks ago.
It's likely that Hetzner doesn't make a loss on that machine, so they won't need to adjust prices there.
Exactly, only some models from the Server Auction were affected. So we only sent emails to customers with those servers. --Katie, Hetzner Online