[Dovecot] Sieve plugin changes 'To' header on redirect

[Patrick Nagel]

Hi,

I'm a bit confused by the fact that the 'To' header is being modified by sieve 
when a message is being redirected.

RFC3028 states in chapter 4.3:
>   The "redirect" action is used to send the message to another user at
>   a supplied address, as a mail forwarding feature does.  The
>   "redirect" action makes no changes to the message body or existing
>   headers, but it may add new headers.  The "redirect" modifies the
>   envelope recipient.
(see http://www.ietf.org/rfc/rfc3028.txt)

The situation here is as follows:

I'm sending a mail to "city at company.net" (To: ...), which is being delivered 
to "city at city.company.net" (Delivered-To: ...).

User city has the following sieve script:
  redirect "other at company.net";
  keep;

One would expect, that the 'To:' header is identical in both mails, but 
instead I get something like this:

Mail in 'city' mailbox:
> Delivered-To: city at city.company.net
> To: city at company.net
> Subject: test mail

(Redirected) Mail in 'other' mailbox:
> Delivered-To: other at city.company.net
> To: city at city.company.net
> Subject: test mail

It seems as if sieve uses the 'Delivered-To' header as the 'To' header in the 
redirected mail - which is not what I need.

Am I misunderstanding something here, or does dovecot's sieve plugin not act 
according to the RFC?

Patrick.

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