On 05 Sep 2018, at 09:58, Robert Moskowitz <rgm@xxxxxxxxxxxxxxx> wrote:
So I suspect my apache server as a proxy relay.
Is there a similar site to mxtoolbox that will test apache for improper relaying?
Are you allowing php? You should be able to root out any badly behaved mail scripts.
You should check exactly what your server is being blocked for. For example, if you are on a dynamic IP there’s nothing necessarily wrong with your configuration, you *will* be blacklisted regardless.