Thanks Ted for responding. FYI, Comcast has fixed this issue. It was
affecting many of their customers. Here is a quote from Comcast (a
message sent out to those of us affected). This issue took a few days to
reach a high-level Comcast engineer but once it did, it got resolved.
There were just so many levels to go thru before you reached someone who
knew what was going on.
Also I think the advice I got about not relying on ISP mail was right on.
<start quote>
It looks like at some point late last week, some number of messages from
Charter were marked as spam. When a sufficient volume of this happens
from a single IP, the platform can institute a temporary block to keep
that IP from sending additional messages to protect users. I talked
with Charter briefly about it, and we've manually removed the block.
Charter also provided a list of outbound IPs, and we've marked the IPs
as protected to keep some policies (including this particular one) from
being enforced in the future. To further complicate things, Charter may
not send Delivery failure notices in all situations, which is why the
senders weren't seeing that the messages didn't go through.
<end quote>
On 1/8/24 10:01 PM, Ted Mittelstaedt wrote:
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
