Re: MIME headers in Procmail

Ruud H.G. van Tol wrote:

> On 2011-07-10 01:58, John Levine wrote:

>> You're right, that works. (Nobody ever said the procmail documentation
>> was any good.) But it still fires up a shell, formail, and a copy of
>> perl, rather a lot of work, and you'd have to do it separately for
>> each header line you'd want to match.
>
> Too obvious: only call it if the message header contains non-ASCII, and
> make it do the full header in one call.

And then, since the headerfield names are still there (formail -X would 
have kept them as well, but if you're not calling formail at all in order 
to save the formail and shell calls, they'll certainly be there), you can 
use procmail's internal parsing to extract SUBJ, TO, FROM, or whatever 
other variables you want, and then use them in subsequent conditions.

So we're down from firing up formail, a shell, and perl for each desired 
header to firing up perl once for each message that needs the work.