how to block mail where From and To are the same?

[Mark Nienberg]

Daniel Maher wrote:

> net result is that many of my users appear to be receiving spam /from 
> themselves/, which is causing some distress amongst the user base.

If you can publish a SPF record for your domain, then the SPF checking in SA would 
catch this.  Personally, I increase the score for SPF Fail, but see recent discussion 
about this for other points of view.

Mark Nienberg