Revision 0003
                                                              2021-02-26

UDN operates its own email infrastructure and does not delegate
filtering decisions to third parties.

Certain email vendors foolishly delegate their filtering decisions to
third party blacklists. The blacklist operators instruct them to setup
their email relay in such a way that any message sent from IP addresses
or domains in the blacklist is rejected before it is delivered to the
recipient.

Because the end user is never aware of any filtering being done, the
blacklisters are offered a great opportunity to use their blacklists for
blackmail. In consequence, blacklisters will campaign to large email
vendors to convince them to use their blacklists, thus increasing their
coercive powers.

As this continues to happen, people get tired of having delivery
problems and rush for centralization. Centralized services are either
too big to be blacklisted or are in active cooperation with the
blacklisters.

The following is a list of email services and their domains that are
known for delegating their filtering decisions to third party
blacklisters.

icloud.com
hotmail.com/outlook.com/msn.com/live.com
gmx.net/gmx.ch/gmx.de/mail.com
laposte.net
orange.fr
soverin.net
protonmail.com/protonmail.ch (appaling response to the problem)

If you contact us from the above services, chances are that you will
never receive a reply. We are however, sending notifications to inform
of the problem.

To contribute to the listing, please contact support@urdn.com.ua