[exim] Sieve filter not working properly anymore, how to deb…

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Autor: Yves Goergen
Data:  
A: List: exim
Assumpte: [exim] Sieve filter not working properly anymore, how to debug?
Hello,

I'm setting up a new mail server with Exim and try to get the Sieve
filter working as it does on another server. But it doesn't. And I don't
know why.

Here's a sieve script for demo@???:

if header :contains ["Subject"] "Newsletter" {
redirect "demo2@???";
}

I'm sending a message from demo3@??? to demo@??? with the
subject "Newsletter". The message is delivered in the inbox of the
original recipient and not forwarded.

Here's another sieve script:

redirect "demo2@???";
stop;

The same message is now both delivered in the original inbox and
forwarded to demo2. It looks like this time the filter action was at
least considered, but the implicit keep should not be effective, but is.

The Exim version is 4.93 on Ubuntu Linux 20.04.

This is a part of my Exim config. All addresses with maildirs and sieve
data is stored in a database.

> SQL_FILTER = \
>     select E'# Sieve filter\n' || sieve_filter \
>     from mail_entries \
>     where local = '${quote_pgsql:$local_part}' and domain = '${quote_pgsql:$domain}' and maildir <> '' and sieve_filter <> ''

>
> begin routers
>
> virtual_user_filter:
>     driver = redirect
>     allow_fail
>     allow_defer
>     allow_filter
>     user = Debian-exim
>     data = ${lookup pgsql{SQL_FILTER}{$value}}
>     address_data = ${lookup pgsql{SQL_QUOTA}{$value}fail}
>     file_transport = address_directory

>
> begin transports
>
> address_directory:
>     driver = appendfile
>     directory = ${if eq{$address_file}{inbox} \
>         {${lookup pgsql{SQL_MAILDIR}{$value}fail}} \
>         {${if eq{${substr_0_1:$address_file}}{/} \
>             {$address_file} \
>             {${lookup pgsql{SQL_MAILDIR}{$value}fail}/.$address_file} \
>         }} \
>     }
>     user = mail
>     maildir_format
>     delivery_date_add
>     envelope_to_add
>     return_path_add


The mainlog doesn't show more than the in and out events. There are
especially no errors. (I can have errors when I leave out the Sieve
filter comment prefix or use an invalid database query or break the
database permissions. I've seen all of this but they're fixed and the
messages are gone.)

How can I debug or fix the Sieve filter in Exim? I thought that the
config I have here is about the same as what's already working with the
Exim from Ubuntu 16.04.

-Yves