nanog mailing list archives
Re: The End-To-End Internet (was Re: Blocking MX query)
From: Sean Harlow <sean () seanharlow info>
Date: Wed, 5 Sep 2012 20:37:46 -0400
On Sep 5, 2012, at 19:07, John Levine wrote:
Not really. Large mail system like Gmail and Yahoo have a pretty good map of the IPv4 address space. If you're sending from a residential DSL or cable modem range, they'll likely reject any mail you send directly no matter what you do.
While I've clearly been on the side of "don't expect this to work", "why do you have your laptop set up like that?", and defending the default-blocking behavior on outbound, this is not true at least for Gmail. I have a test Asterisk box which I've been really lazy about setting up properly that successfully sends status messages from my home cable modem to my Gmail-hosted personal domain every day, even getting through with a completely bogus source address. It's never even been flagged as possible spam. Maybe Gmail does more detailed analysis of some kind and sees that I'm also checking my email from the same IP that's sending these messages, I don't know, but they are not just blocking anything coming in from a random cable IP. I'll bet it raises the "spam likelihood" or whatever as it probably should, but it's not a total block. --- Sean Harlow sean () seanharlow info
Current thread:
- Re: The End-To-End Internet (was Re: Blocking MX query), (continued)
- Re: The End-To-End Internet (was Re: Blocking MX query) Michael Thomas (Sep 05)
- Re: The End-To-End Internet (was Re: Blocking MX query) Michael Thomas (Sep 05)
- Re: The End-To-End Internet (was Re: Blocking MX query) Henry Stryker (Sep 05)
- Re: The End-To-End Internet (was Re: Blocking MX query) John Levine (Sep 05)
- Re: The End-To-End Internet (was Re: Blocking MX query) Michael Thomas (Sep 05)
- Re: The End-To-End Internet (was Re: Blocking MX query) Daniel Taylor (Sep 05)
- Re: The End-To-End Internet (was Re: Blocking MX query) Michael Thomas (Sep 05)
- Re: The End-To-End Internet (was Re: Blocking MX query) Daniel Taylor (Sep 05)
- Re: The End-To-End Internet (was Re: Blocking MX query) John Levine (Sep 05)
- Re: The End-To-End Internet (was Re: Blocking MX query) valdis . kletnieks (Sep 05)
- Re: The End-To-End Internet (was Re: Blocking MX query) Sean Harlow (Sep 05)
- Re: The End-To-End Internet (was Re: Blocking MX query) Jimmy Hess (Sep 05)
- Re: The End-To-End Internet (was Re: Blocking MX query) John Levine (Sep 06)
- Re: The End-To-End Internet (was Re: Blocking MX query) Sean Harlow (Sep 04)
- Re: The End-To-End Internet (was Re: Blocking MX query) William Herrin (Sep 04)
- Re: The End-To-End Internet (was Re: Blocking MX query) Jay Ashworth (Sep 04)
- Re: The End-To-End Internet (was Re: Blocking MX query) Izaac (Sep 05)
- Re: The End-To-End Internet (was Re: Blocking MX query) TJ (Sep 07)
- Re: The End-To-End Internet (was Re: Blocking MX query) David Miller (Sep 04)
- Re: The End-To-End Internet (was Re: Blocking MX query) Michael Thomas (Sep 04)