You may want to increase the level of your spam assasin score. Take a look at the score on the email that got caught accidently.

I run mine up around 7 or so, and so I have to deal with a few spams getting through but I havn't had a single false positive in a few months now (I still double check the other folder).

You can also add that sender to your "whitelist".

- Ed

In CPanel->Mail-> You can enable spam assasin and there is also an option to configure it.

To get the message in the inbox from horde, just check the box next to it goto the top and there is a drop down menu, you will find an option to "move to:" and then instruct it to move it to the "inbox".

- Ed