mod_s2s_keepalive: Ignore errors from the local server If a stanza can't be delivered and instead an bounce is generated, the origin of the error, when different from the stanza 'from' should be indicated in the 'by' attribute of the <error>, which we look for here so this doesn't count as a successful ping. An error that does come from the remote means we have connectivity, but probably no XEP-0199 handling. This is fine. We care about connectivity, not protocol.

Introduction
============

This module checks the IP addresses attempting to register an account
against a DNSBL, blocking the attempt if there is a hit.

Configuration
=============

  Option              Type     Default
  ------------------- -------- ------------
  registration\_rbl   string   *Required*

Compatibility
=============

Prosody Trunk
[1a0b76b07b7a](https://hg.prosody.im/trunk/rev/1a0b76b07b7a) or later.