Comment anti-spam sites force centralization, help SIGINT (Score 2) 235
Originally email was decentralized in a practical way. Now, unless you
arrange for your outbound email to arrive from a server operated by a
large email provider, your deliverability is probably low. All of the
email reputation systems, blocklists, DKIM, SPF, etc. are advertised
as anti-spam measures. The reality is that they force email
centralization in a way that helps the monitoring of email by the
major SIGINT players.