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Comment: Re:Testing and config verification (Score 3, Informative) 405

by hawkbug (#48382467) Attached to: Ask Slashdot: How To Unblock Email From My Comcast-Hosted Server?

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.

Comment: Re:The don't give a Flying-F*** about your SPF (Score 1) 405

by hawkbug (#48382253) Attached to: Ask Slashdot: How To Unblock Email From My Comcast-Hosted Server?

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.

Comment: Re:First step is to collect data. (Score 2) 405

by hawkbug (#48381305) Attached to: Ask Slashdot: How To Unblock Email From My Comcast-Hosted Server?

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.

Comment: Re:Auth failure (Score 1) 405

by hawkbug (#48381179) Attached to: Ask Slashdot: How To Unblock Email From My Comcast-Hosted Server?

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.

Comment: Re:Sounds like a spammer (Score 1) 405

by hawkbug (#48381147) Attached to: Ask Slashdot: How To Unblock Email From My Comcast-Hosted Server?

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.

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