Re: [Evolution] automagic mail forward -- a solution

[Not Zed <notzed ximian com>]

It might be easier just requesting these new things in a bug report. 
Dunno if they're there already.

The code required for a forward-to and shell-with-stdin thing is
probably not too much, particularly with some new process code we have. 
Would probably have to wait till after 1.4 though.

On Thu, 2003-03-06 at 08:50, guenther wrote:
> cheers( folks );
>
> As this question came up several times the last days on these lists,
> here is a practical solution.
>
> When thinking about another problem on the evolution mailing list, I
> found a way, how to do that. I will discuss the whole problem in this
> mail -- feel free to skip to the code. ;-)
>
> Any suggestions on improving this approach is welcome.
>
>
> ** Filter and Actions
>
> What we want is forwarding mail by Filter. The problem is, there is no
> 'forward' Action and there is no 'pipe message to shell command' Action
> too.
>
> We can circumvent that problem with a little bit of programmers logic,
> as there is a 'pipe to shell command' Criterion. The logic is, that all
> Criteria are evaluated in the defined order. Hitting the first failing
> Criterion will prevent all other Criteria from being evaluated.
>
> So we can define all Criteria we wanna match to forward a mail and add a
> last Criteria, that actually will forward the mail. We are only
> interested in the side-effects, thus we don't care about the return
> code.
>
>
> ** Setting up the Filter
>
> Create a incoming Filter like this example:
>
>  Execute actions:
>   'if all criteria are met'
>
>  Criterion:
>   'Subject' 'starts with' '[forward]'
>   # define as much, as you like
>
>  Criterion:
>   'pipe message to shell command' 'my-forward-script.sh' 'returns' '0'
>
>  Action:
>   'stop processing'
>
> The pipe Criterion (actually a command) will only be executed, when all
> leading Criteria are met. We really don't care about the Action...
>
>
> ** Fowarding Mail by Shell Script
>
> Instead of the 'my-forward-script.sh' we can use a one line shell
> command:
>
>  formail -I 'To: user forward host' -I Cc: | sendmail -t
>
> I just could not test that, as my sendmail (postfix actual)
> configuration really is broken...
>
> What does it do? formail rewrites the header, to avoid bugging others.
> All To: and Cc: headers are deleted and we set a new recipient. The -t
> option tells sendmail to use the recipients in the mail header.
>
>
> To test that beforehand, you can use something like the following
> command, which will append all mails to a file instead of sending them.
>
>  formail -I 'To: user forward host' -I Cc: >> /home/user/tmp/forward
>
>
> ** Prerequisites, more Info
>
> You will need formail and an MTA like sendmail installed (and
> configured...)
>
> man formail, man sendmail ;-)
>
>
> btw: I still prefer procmail for that -- if you have the possibility to
> use it.
>
>
> I hope, that will get you working. Please drop me a note and report
> improvements here, if you actually use it...
>
> ...guenther
>
>
> -- 
> char *t="\10pse\0r\0dtu\0  ghno\x4e\xc8\x79\xf4\xab\x51\x8a\x10\xf4\xf4\xc4";
> main(){ char h,m=h=*t++,*x=t+2*h,c,i,l=*x,s=0; for (i=0;i<l;i++){ i%8? c<<=1:
> (c=*++x); c&128 && (s+=h); if (!(h>>=1)||!t[s+h]){ putchar(t[s]);h=m;s=0; }}}
>
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