matt wrote:
> I will try and explain what I want again as I dont think I have done 
> that very well. And I can also prove via the docs that the filter you 
> tried (the one I posted) does not work.
>   

You've tried to prove it logically, and failed because of logical 
errors.  Don't try to prove this via the docs.  Demonstrate that it 
doesn't work the way you expect with actual logs.

> - the mail filter is for user [EMAIL PROTECTED]
> - when matt recieves any mail from [EMAIL PROTECTED], those mails should 
> be checked for the phrase "very important message"
> - if the phrase exists, then a copy of the message should be forwarded 
> to [EMAIL PROTECTED]
> - the message should also be delivered normally
>
> -if a message comes through with only one of the above criteria, the 
> message should not be forwarded to [EMAIL PROTECTED]
>   

That's right, and that's what should happen with the example you gave.  
It's what *does* happen when I tested it.

> As I am learning about this by reading the docs, using && does not work 
> because if expression1 is false, expresssion2 is not checked...

That's right.  If expression1 is false, then expression1 && expression2 
can not possibly be true.  Since the interpreter already knows that the 
&& will be false, it doesn't check the latter, because that would be a 
waste of time (time == CPU resources).

> ... and if 
> expression 1 is true, expression2 is checked and expression1 is not 
> considered.
>   

So?  If expression1 is true, then expression2 is evaluated.  If 
expression2 is true, then the whole statement is true.  If it's not, 
then the whole statement is not.  You're describing the way that && 
works in pretty much every language (except VB.  I'm told VB evaluates 
everything regardless.)

>     /|expression1|/ && /|expression2|/
>
> If /|expression1|/ evaluates to a logical false, the result of the && is 
> /|expression1|/, otherwise it's /|expression2|/, which is evaluated.
>   

Which isn't a problem.  You get a positive result when both tests are 
positive, and a negative result if either test, or both, is negative.  
This is what you expect.


> so I need to understand how to make a filter that  checks for the phrase 
> only after validating the email is from [EMAIL PROTECTED]
>   

You already do.  The sample that you posted works the way you expect it to.


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