On Wed, 2 Apr 2014 20:00:09 +0100
Brian <[email protected]> wrote:

> How does one determine that?

The server logs:

<[email protected]>... H:RPBL [82.195.75.100] Connection refused due to
 abuse. Please contact your E-mail provider. (in reply to RCPT TO command))

<[email protected]>... H:RPBL
[82.195.75.100] Connection refused due to abuse. Please contact your E-mail
provider. (in reply to RCPT TO command))


$ host 82.195.75.100
100.75.195.82.in-addr.arpa is an alias for 100.64-26.75.195.82.in-addr.arpa.
100.64-26.75.195.82.in-addr.arpa domain name pointer bendel.debian.org.

This is exactly how mail systems work and large providers are in constant 
contact
with each other and have staff to deal with getting their gateway IP's off these
fun fun fun blacklists.

http://arstechnica.com/security/2013/03/when-spammers-go-to-war-behind-the-spamhaus-ddos/


-- 
Enzymes are things invented by biologists that explain things which
otherwise require harder thinking.
                -- Jerome Lettvin


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