Michael Hutchinson wrote: > > Hello, > > > > There was some discussion on this list a while back about catching > Spam that contains the same E-Mail address in the TO and FROM lines. I > think it was decided that this could not be done, for some reason. > I don't know that anyone said it couldn't be done. It is however rather expensive. That long multi-header regex could take a very long time to run because it may have to scan the entire header block if one of the From/To headers is missing.
Besides, Most "to and from are same" problems really boil down to "unauthorized host forging my domain as the sender and delivering mail to my server". There are many ways to deal with this problem already if it also occurs in the envelope FROM. SPF for example.
