I can't currently use this board at home, and most likely many people in Germany can't. See this picture for the error. Error
What seems to be happening: Spamhaus, apparently a provider for blacklists as spam protection, currently lists all e-mail traffic from telefonica, one of the big ISPs in germany, as not trustworthy. For this reason I can't post anything using my phone/mobile internet. At home, I'm apparently blocked because my IP doesn't have a known email provider. Which is to be expected, cause I don't have an email server running in my network.
Regardless of the reason spamhaus gives for blocking my access: This is a false positive. My addresses should not be blocked for anything but server-to-server-mail-transfer. For reference: The addresses are listed in the PBL, according to spamhaus, which is only meant for use by email servers.
I don't know if this anti-spam policy has been used for a long time and if this is just a temporary problem or if new anti-spam software has been installed to the board and is not yet configured very well, but this is very inconvenient. I can't post to this board using a VPN to my uni, but that's annoying and probably not a possible solution for other users who have the same problem.
Loopy, can you have a look at this problem? I can provide you with more information, if you need that, but I didn't want to make my IP public.