I have found that recently a spammer has been using a mod_proxy configuration, (that was meant to allow for an easier transition to a new naming scheme, as well as changes to a backend software) as a spam relay. The spammer has been using HTTP POST requests to send these messages with POST HTTP://mailserver:25/ HTTP/1.1 With some research it looks like this is an automated process including the initial scan stage. When I contacted Apache in regards to this, the response was not very promising. This problem would be a simple fix with implementing the AllowConnect configuration option within proxy_http, to prevent outbound connections. Jason
