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
s...@seanharlow.info


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