Re: ietf.org unaccessible for Tor users

"John R Levine" <johnl@taugh.com> Tue, 15 March 2016 19:32 UTC

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Date: 15 Mar 2016 15:32:43 -0400
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From: "John R Levine" <johnl@taugh.com>
To: "Theodore V Faber" <theodore.v.faber@aero.org>
Subject: Re: ietf.org unaccessible for Tor users
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>> About 90% of SMTP is spam.  SMTP from Tor nodes is so close to 100%
>> that I don't know anyone who accepts mail from them.
>
> Um, 90% by weight or by volume?

About the same either way.

> More seriously what's the claim there: number of connections? Bytes?
> Messages? Recipients?  (A possibility is that all of them are 90%, but
> that seems unlikely to me and would be worh pointing out, too.)

Really, it's about the same.  People have been collecting stats on this 
for upwards of a decade.  For more details, Google is your friend.

> Besides which 90% vs 100% doesn't seem very significant to me.

I gather you've never run a large mail system or talked to people who do. 
The 90% is an average over all sources.  Some sources like the IETF's mail 
system send about 0% spam, some like Tor and botnetted old Wordpress 
servers send 100%, others are in between.  To keep the load manageable, 
you reject mail from the very spammy sources and use your servers to 
filter what you accept.

There's a reason that every mail system of any size has a Spamhaus 
subscription.

R's,
John