On Fri, Aug 28, 2015 at 10:48:10AM -0700, James Bottomley wrote:

> That basically means the entire service provider netblock is blacklisted
> because someone bought a co-lo to send spam ... talk about group
> punishments.  The problem is that companies trust services they pay for
> (however unreliable the providers are) so as this creeps along we're
> going to find large areas of the internet not accepting email from
> people who don't send it from a large mail aggregator (like gmail)
> because setting up a spam list based on extrapolation from a few reports
> is a cheap thing to do.

It's not just random companies doing this, a lot of the more militant
anti-spam people tend to get angry with providers (and sometimes whole
countries) based on their normal incoming traffic patterns so they're
willing to tolerate what they see as a vanishingly small false positive
rate.  Which means you end up being able to tell them that the reason
you're not replying to their mail is that they've blacklisted the entire
country you're in (even with a relay if they scan received lines) :/