SRS in SIEVE

Hello everyone,

I noticed that there are options prefixed srs_ in imapd.conf.
I tried to set it up:

srs_alwaysrewrite: 1
srs_domain: domain.example
srs_hashlength: 3
srs_secrets: SomePassword
srs_separator: =

But mails redirected by sieve are not using SRS. They just have the 
original sender as MAIL FROM, and thus fail SPF check.

Sieve script was just simple:

if true
{
        redirect "[email protected]";
}

or


require ["copy"];
if true
{
        redirect :copy "[email protected]";
}


Has anyone working SRS for SIEVE? What do I have to do?

-- 
Best Regards
         Vladislav Kurz

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