This is standard a lot of spam filters just automatically blacklist blocks of dynamically assigned IP addresses. Charter uses specific IP subnets for DHCP and Spamhaus ZEN likely knows about those subnets. Charter might have even reported them to Spamhaus.
Ted -----Original Message----- From: PLUG <plug-boun...@lists.pdxlinux.org> On Behalf Of markcasi...@comcast.net Sent: Thursday, January 4, 2024 10:13 PM To: 'Portland Linux/Unix Group' <plug@lists.pdxlinux.org> Subject: Re: [PLUG] email issues I put my charter IP address into http://mxtoolbox.com/SuperTool.aspx and received info that my IP address was blacklisted ... on the Spamhaus ZEN blacklist. I have no idea what that means. I assure you no one in this household is doing bad stuff on the internet. Charter support told me to contact my router manufacturer (Why, I wonder?). The quote I got from Charter was "There is no way to assign this issue as it does not involve accessibility of services. And would not be able to further escalate the issue." I see it as involving accessibility of services ... my charter email does not work, but I have had no success explaining that. Have I lost Charter as my cable provider? Does anyone have advice on what I can do? -mark -----Original Message----- From: PLUG <plug-boun...@lists.pdxlinux.org> On Behalf Of Ben Koenig Sent: Tuesday, January 2, 2024 1:02 PM To: Portland Linux/Unix Group <plug@lists.pdxlinux.org> Subject: Re: [PLUG] email issues On Tuesday, January 2nd, 2024 at 12:10 PM, markcasi...@comcast.net <markcasi...@comcast.net> wrote: > I am unable to send charter ==> comcast > > But I can send > charter ==> IEEE, which is auto forwarded ==> comcast. > That makes it look like comcast is having an issue specifically with charter. I would be curious to know if you can receive mail from other charter accounts. Is there anyone else you know on that service who can send you a test? What's also odd is that you are not having issues with forwarded emails or the PLUG mailing list. PLUG sends emails on behalf of the sender which can cause some email services to silently reject the message. I have a similar issue on this proton account when other proton users post to PLUG. It is possible that comcast is refusing to accept that the issue is on their end because something they expect to see is missing from your charter message headers. The trick is getting past their T1 support team and getting someone who will actually diagnose the issue. Failing that, your only other option is to lawyer up. -Ben
