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Practical Magnetic Levitating Transmission Gear System Loses Its Teeth

hawkbug Re:PBS had a documentary... (103 comments)

And unfortunately, this is why the reliability of the Nissan Pathfinder has become utter shit. I wanted to buy a 2014 model, but the horrific reviews of failing transmissions at 30k miles scared me and many others off. For good reason I might add.

about three weeks ago
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How the Rollout of 5G Will Change Everything

hawkbug Who cares (216 comments)

Who cares when your artificially and ridiculously low data cap is exceeded in 5 minutes?

about three weeks ago
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Ask Slashdot: How To Unblock Email From My Comcast-Hosted Server?

hawkbug Re:Depends what sort of solution you will accept (405 comments)

I agree that moving to a VPS would solve the problem. But you got me - I'm stubborn as all hell and refuse to let this beat me. I really want to find a technical solution to keep things the same as they are now.

about a month ago
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Ask Slashdot: How To Unblock Email From My Comcast-Hosted Server?

hawkbug Re:Testing and config verification (405 comments)

You guys crack me up. To answer the questions:

1) Absolutely. The first thing I did when I moved to this net block on comcast is have them create my associated pointer records, so reverse DNS is correct.

2) Yes, MX records are correct.

3) I've checked every blacklist using sites like mentioned above. My IP does not exist on a single one.

4) No forwarding.

5) Yes, I monitor my network traffic in various ways - and no, I am not sending spam. If I was, it would be a matter of hours before I would show up on an RBL anyway, which I'm not on.

6) Absolutely. I have paid for a cert that matches my domain. It's not self signed.

I think some others have brought up some things that I'm not doing:

1) DKIM. I've read about this, but I didn't realize a lot of people were using it yet. Sounds like they are and that I'm behind the curve here.

2) DMARC. Same here. I've read about it, but not using it yet.

I'm also using SPF.

about a month ago
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Ask Slashdot: How To Unblock Email From My Comcast-Hosted Server?

hawkbug Re:First step is to collect data. (405 comments)

Yes, I've monitored traffic. And no, my system has not been compromised.

about a month ago
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Ask Slashdot: How To Unblock Email From My Comcast-Hosted Server?

hawkbug Re:Business class connection (405 comments)

If you read the actual summary up top, you'll see that I am using business class. And yes, I do have a valid domain associate with it, reverse PTR record and all.

about a month ago
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Ask Slashdot: How To Unblock Email From My Comcast-Hosted Server?

hawkbug Re:I'd reject your email too. (405 comments)

Yes, obviously I have an FQDN. And yes, I have SPF set up - that was mentioned in my original question up top. No, I do not have DKIM or DMARC set up, but based on a lot of feedback today, I most certainly will by tomorrow morning. Thank you for your input.

about a month ago
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Ask Slashdot: How To Unblock Email From My Comcast-Hosted Server?

hawkbug Re:First step is to collect data. (405 comments)

This has been done for the past 2 years, so I'm good there.

about a month ago
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Ask Slashdot: How To Unblock Email From My Comcast-Hosted Server?

hawkbug Re:First step is to collect data. (405 comments)

DMARC is definitely at the top of my list to make sure I have set up after reading about it today. Thank you for the input.

about a month ago
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Ask Slashdot: How To Unblock Email From My Comcast-Hosted Server?

hawkbug Re:The don't give a Flying-F*** about your SPF (405 comments)

What?? That link you posted references users who are sending email AS yahoo email users, via a server that is not Yahoo. That is not all what my question was about. What your link does show is that those major providers all use DMARC, so that's an interesting item that ties all those providers together.

about a month ago
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Ask Slashdot: How To Unblock Email From My Comcast-Hosted Server?

hawkbug Re:Call Comcast? (405 comments)

You forgo the last part of that I assume, the 7.

about a month ago
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Ask Slashdot: How To Unblock Email From My Comcast-Hosted Server?

hawkbug Re:First step is to collect data. (405 comments)

Yes, I have 5 IPs. It's a pain, but yes, I can try one of the others. In regards to the cable modem - it's set up in a manner that the single outgoing IP for my mail server is directly linked to it. So, when I say I ran wireshark on the traffic, I did so for that IP. It is the only machine on the network that uses that IP. The results were well within what I expected for email traffic. Most of the traffic is incoming spam, and the only outgoing messages are being sent by valid users - and not many of them at that.

about a month ago
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Ask Slashdot: How To Unblock Email From My Comcast-Hosted Server?

hawkbug Re:Auth failure (405 comments)

I've run SPF for years now, and I pass all the associated tests there. I have a valid PTR record that matches my domain. I do not currently use DKIM, but I guess that's my next attempt at fixing this. DMARC also sounds interesting, I have never heard of that before. I will gladly configure DKIM here and then look into DMARC. Thanks for the information.

about a month ago
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Ask Slashdot: How To Unblock Email From My Comcast-Hosted Server?

hawkbug Re:Sounds like a spammer (405 comments)

I'm the guy who asked the question, and spammer I am not. I hate spam more than most people since I run my own mail server, and have for years. Back before spamassassin, my email server was basically unusable, thanks to the fact my personal email address was associated with my whois record. I'm just a poor asshole who signed a 3 year contract with comcast, and 2 years in, my connection became unusable for relaying email.

about a month ago
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Ask Slashdot: How To Unblock Email From My Comcast-Hosted Server?

hawkbug Re:How I fixed it (405 comments)

Yes, I have proper reverse DNS and SPF records. So, I'm good to go there.

about a month ago
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Ask Slashdot: How To Unblock Email From My Comcast-Hosted Server?

hawkbug Re:First step is to collect data. (405 comments)

Exactly. I would love to know what centralized IP blacklist that those 3 providers use.

about a month ago
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Ask Slashdot: How To Unblock Email From My Comcast-Hosted Server?

hawkbug Re:First step is to collect data. (405 comments)

Yes, before I brought this question to Slashdot, I did my homework first. I've scoured logs, check RBLs, used wireshark, etc. It's definitely not a misconfiguration on my end or an issue with complaints resulting from spam. The traffic coming from my server is so ridiculously small, that I was shocked to begin getting messages like these from those email providers.

The only conclusion that I can draw is that these major providers all use the same dynamic, or what they interpret as dynamic anyhow, IP lists and block based on them. I can understand that... the part that I have an issue with is that I have no recourse to have my IP reevaluated.

about a month ago
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Ask Slashdot: How To Unblock Email From My Comcast-Hosted Server?

hawkbug Re:Call Comcast? (405 comments)

I have verified. I am not on any RBLs as I mentioned in my original question. As for whether or not my IP range is residential, I was told when I signed up that it was not. However, I have no way that I know of to verify that.

about a month ago
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Ask Slashdot: How To Unblock Email From My Comcast-Hosted Server?

hawkbug Re:Call Comcast? (405 comments)

Yep, I've used that site and checked it against that list. 0 results found on the blacklist check.

about a month ago

Submissions

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What Can I Do To "Unblock" Email From My Server, Hosted On Comcast?

hawkbug hawkbug writes  |  about a month ago

hawkbug (94280) writes "For the past 15 years, I have hosted my own email server at home and it's been pretty painless. I had always used a local Denver ISP on a single static IP. Approximately 2 years ago, I switched to a faster connection, which now is hosted on Comcast. They provide me 5 static IPs and much faster speeds. It's a business connection with no ports blocked, etc. It has been mostly fine these last 2 years, with the occasional outage due to typical Comcast issues. About 2 weeks ago, I came across a serious issue. The following email services started rejecting all email from my server:

Hotmail
Yahoo
Gmail

I checked, and my IP is not on any real time blacklists for spammers, and I don't have any security issues. My mail server is not set as an open relay, and I use SPF records and pass all SPF tests. It appears that all 3 of those major email services started rejecting email from me based on a single condition: Comcast. I can understand the desire to limit spam — but here is the big problem: I have no way to combat this. With Gmail, I can instruct users to flag my emails as "not spam" because the emails actually go through, but simply end up in the spam folder. Yahoo and Hotmail on the other hand, just flat out reject the traffic at lower level. They send rejection notices back to my server that contain "tips" on how to make sure I'm not an open relay, causing spam, etc. Since I am NOT doing any of those things, I would expect some sort of option to have my IP white listed or verified. However, I can not find a single option to do so. The part that bugs me is that this happened 2 weeks ago with multiple major email services. Obviously, they are getting anti-spam policies from a central location of some kind. I don't know where. If I did, I could possibly go after the source and try to get my IP white listed. When I ask my other tech friends what they would do, they simply suggest changing ISPs. Nobody likes Comcast, but I don't have a choice here. I'm 2 years into a 3 year contract. So, moving is not an option.

Is there anything I can do to remedy this situation?"

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