We require registration to ensure that messages sent through abuse.net come from real e-mail addresses so system managers can send questions and replies, and that users accept our terms of service. Mail from forged or ``munged'' addresses is logged and discarded.
If you use a "Challenge/Response" system: An unfortunate recent development is "Challenge/Response" (C/R) systems that attempt to verify that messages are not spam by sending challenge messages to all of a user's correspondents, thereby moving the cost and effort of mail filtering from the C/R user to his unwilling correspondents. If you use a C/R system, it is up to you to configure it so that it works with abuse.net. In particular, if you use abuse.net, you may receive automated messages from postmaster@abuse.net, new@abuse.net, register@abuse.net, and any address to which you send an abuse report, so you must adjust your C/R system not to challenge them.
If we receive C/R challenges to abuse.net addresses, we will cancel your registration. If your registration is cancelled and you're sure you've fixed your C/R system, you're welcome to reregister, but if you do and we receive further C/R challenges, we'll treat them as annoying messages as described in section 2 of the abuse.net, terms of service below.