Re: [Exim] Exim 4.1: rewriting question (changing "From:" he…

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Auteur: Ralf G. R. Bergs
Datum:  
Aan: exim-users@exim.org
CC: Philip Hazel
Onderwerp: Re: [Exim] Exim 4.1: rewriting question (changing "From:" header depending on recipient)
On Tue, 13 Aug 2002 20:53:23 +0100 (BST), Philip Hazel wrote:

>On Tue, 13 Aug 2002, Ralf G. R. Bergs wrote:
>
>> why doesn't the following work?
>>
>> rabe@???     \
>>         "${if eq {${lc:$h_To:}}{someone@???} {rabe-lkt}fail}" fQ

>>
>> I would like to rewrite the "From:" header with "rabe-lkt@<qualify>" if

it's
>> "rabe@???" AND the recipient of the message is
>> "someone@???."
>>
>> I've tried several other variables instead of $h_To: but nothing helped:
>> $received_for, $recipients.
>
>What happened? Did it just not rewrite? What was the contents of the To:


It just didn't rewrite, but you've pointed me at what I did wrong...

>header line when it failed? Are you sure 'eq' is the right test? It
>won't match things like
>
> To: some person <someone@???>


THAT'S the problem!! My mailer writes addresses I enter as
"someone@???" (without the double quotes) like follows:

    "someone@???" <someone@???>


>for example (not to mention more exotic RFC 822-isms). And what do you
>want to happen for messages that are sent to more than one recipient?
>Rewrite or not rewrite?


I'm well aware of these problems, but they're only of academic nature. I need
only handle these simplest cases like the above.

Thanks to your helpful hint I was able to get this running. My rewrite rule
now looks like this:

rabe@???     \
  "${if and {
          {def:h_To:}
          {match
             {$h_To:}
             {\\N^(\"someone@???\" )?<?someone@???>?$\\N}
          }
        } {rabe-lkt} fail
     }" fFrQ


I've broken the line to make it more readable, I hope it's still obvious how
the expression looks like.

The pattern recognizes addresses like the following:

    "someone@???" <someone@???>
    <someone@???>
    someone@???


Is this, in your eyes, the optimal way of writing this, or can you give me
additional hints about how to further improve it?

Thanks,

Ralf


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