sieve_extprograms: how to filter original message twice?

[Stephan Bosch]

Op 10-6-2016 om 0:57 schreef N0T3P4D:
> Hi,
>
> I use dovecot and sieve_extprograms to encrypt all incoming messages with the help of a Python script.
> Now, I want to process the _original_ message a second time. However, as expected, the second filter is applied to the already filtered message.
>
> For reference, here's a copy of the sieve script in question:
>
> if address :matches "To" "X at Y.Z" {
>      fileinto "INBOX";
>      filter "gpgit.py" ["X at Y.Z", "--encrypt"];
>      fileinto "encrypted";
>      filter "gpgit.py" ["X at Y.Z", "--wrap"]; # Should be applied to the original message but uses the result of the first filter command
>      fileinto "wrapped";
>      stop;
> }
>
> Does anyone have an idea how to modify the script to get the intended result?
>
> Please cc me, as I'm not subscribed.

The Sieve language currently has no means to manage several modified 
versions of a message in parallel; there is no means to revert back to 
an older version of a modified message. So, unfortunately, I see no way 
to implement a Sieve script like this at this time :/.

The only (ugly) solution I see is to use a pipe program rather than a 
filter program. The pipe program will then fork and filter the e-mail 
twice and store it into the required folders using doveadm.

Regards,

Stephan.