[156086] in North American Network Operators' Group
Re: The End-To-End Internet (was Re: Blocking MX query)
daemon@ATHENA.MIT.EDU (Sean Harlow)
Wed Sep 5 20:38:35 2012
From: Sean Harlow <sean@seanharlow.info>
In-Reply-To: <20120905230707.24414.qmail@joyce.lan>
Date: Wed, 5 Sep 2012 20:37:46 -0400
To: "John Levine" <johnl@iecc.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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
