This looks a lot like a bug. Will investigate..

Op 15-8-2025 om 12:29 schreef Niklas Meyer via dovecot:

Hello everyone,

I am currently working on porting the Dovecot 2.4 configuration from the
latest 2.3 version.

During this process, I encountered issues with the Sieve filters,
particularly those related to SQL dict mappings.

The previous (2.3) configuration looked like this and worked:

map { pattern = priv/sieve/name/$script_name table = sieve_before username_field = username value_field = id fields { script_name = $script_name } }

map { pattern = priv/sieve/data/$id table = sieve_before username_field = username value_field = script_data fields { id = $id } }

This resulted in the following SQL queries on the MySQL server:

2025-08-15 11:01:29.237511 SELECT id FROM sieve_after WHERE script_name = 'active' AND username = '[1]frittenjonas@derlinkman.de' 2025-08-15 11:01:29.236416 SELECT id FROM sieve_before WHERE script_name = 'active' AND username = '[2]frittenjonas@derlinkman.de'

As you can see, there are SQL mappings for sieve_before and sieve_after,
alongside a local file loaded prior to the SQL settings, as they are
user-based.

In Dovecot 2.3, everything worked and the scripts were executed. In 2.4,
however, they no longer run.

I adapted the configuration for dict SQL mapping for Sieve filters
according to the documentation:

dict_map priv/sieve/name/$script_name { sql_table = sieve_before username_field = username value_field id { }

# The script name field in the table to query
key_field script_name {
  value = $script_name
}

}

dict_map priv/sieve/data/$id { sql_table = sieve_before username_field = username value_field script_data { } key_field id { value = $id } }

This also results in the dict proxy querying the database with the same
pattern as before:

2025-08-15 11:11:47.175184 SELECT id FROM sieve_after WHERE script_name = 'active' AND username = '[3]frittenjonas@derlinkman.de' 2025-08-15 11:11:47.172952 SELECT id FROM sieve_before WHERE script_name = 'active' AND username = '[4]frittenjonas@derlinkman.de' 2025-08-15 11:11:47.155786 SELECT id FROM sieve_after WHERE script_name = 'active' AND username = '[5]frittenjonas@derlinkman.de' 2025-08-15 11:11:47.136030 SELECT id FROM sieve_before WHERE script_name = 'active' AND username = '[6]frittenjonas@derlinkman.de'

However, unlike in 2.3, it now queries the DB twice.

In the Sieve debug logs, I see the following:

[7]https://pastebin.com/PTKkLsDQ

Notably:

Aug 15 12:22:24 43664c142e0a dovecot: lmtp([8]frittenjonas@derlinkman.de)<2407><mPFNN2AKn2hnCQAAhwrv7A>: Debug: Local delivery failed: Temporarily unable to access necessary Sieve scripts

This line concerns me.

Here are the current Sieve script declarations:

sieve_script before { type = before driver = file path = /var/vmail/sieve/global_sieve_before.sieve }

sieve_script before2 { type = before driver = dict name = active dict proxy { name = sieve_before sieve_script_bin_path = /var/vmail/sieve_before_bindir } }

sieve_script after { type = after driver = file path = /var/vmail/sieve/global_sieve_after.sieve }

sieve_script after2 { type = after driver = dict name = active dict proxy { name = sieve_after sieve_script_bin_path = /var/vmail/sieve_after_bindir } }

Personal scripts

sieve_script personal { type = personal driver = file path = ~/sieve active_path = ~/.dovecot.sieve }

The dict proxy configuration, pointing to the dict_map SQL query above,
looks like this:

dict sieve_after { driver = sql !include /etc/dovecot/sql/dovecot-dict-sql-sieve_after.conf }

dict sieve_before { driver = sql !include /etc/dovecot/sql/dovecot-dict-sql-sieve_before.conf }

Thanks for your guidance.

Kind regards

Niklas Meyer

Maintainer of the mailcow project

References

Visible links
1. mailto:frittenjonas@derlinkman.de
2. mailto:frittenjonas@derlinkman.de
3. mailto:frittenjonas@derlinkman.de
4. mailto:frittenjonas@derlinkman.de
5. mailto:frittenjonas@derlinkman.de
6. mailto:frittenjonas@derlinkman.de
7. https://pastebin.com/PTKkLsDQ
8. mailto:frittenjonas@derlinkman.de

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