On Thu, Apr 03, 2025 at 10:17:22PM +0200, Dmytro Alieksieiev via Postfix-users
wrote:
> I faced issue with splitting emails via local filter and
> destination_recipient_limit = 1 under low memory condition which
> result in duplicated emails in queue.
Not duplicated, simply retained, if/when information that a recipient is
delivered did get recorded in the queue file. What sort of "local
filter" are you talking about?
> 1. Postfix get email with multiple rcpts
>
> 2. taking couple of rcpts (depending on settings, 3 by default) and creates
> new email in queue per each recipient
Why? Postfix does not by default do that, unless you configure
self-delivery. What is the purpose of the internal delivery?
> 3. reach OOM
That's your actual problem. Perhaps your filter uses unreasonable
memory, tune the filter and its concurrency, if that's a factor in
its memory requirements.
> 4. new emails stay in queue, but original email not get rcpt marked as
> "done", as result on next queue rerun they will be spitted again resulting
> in duplicated messages
What new emails? Your problem description is much too fuzzy.
> Can be reproduced in docker with mem limit f.e. 100mb by send one email with
> 50 rcpts with next configuration:
With server systems routinely shipping with 256GB of RAM or more these
days, 100MB seems rather undersized. Don't do that.
> 1. Extra main.cf:
>
> smtpsplit_destination_recipient_limit = 1
What and why is "smtpsplit"?
> 2. Extra master.cf:
>
> smtpsplit unix - - n - - smtp
> -o syslog_name=postfix-split
> -o smtp_send_xforward_command=yes
> -o disable_mime_output_conversion=yes
> -o smtp_generic_maps=
> -o smtp_header_checks=
What is the intent here? You should probably set a lower process limit
on this service.
> 127.0.0.1:5025 inet n - n - - smtpd
> -o syslog_name=postfix-after-split
> -o content_filter=
> -o cleanup_service_name=cleanupsplit
> -o receive_override_options=no_unknown_recipient_checks
> -o smtpd_helo_restrictions=
> -o smtpd_client_restrictions=
> -o smtpd_sender_restrictions=
> -o smtpd_relay_restrictions=
> -o smtpd_recipient_restrictions=permit_mynetworks,reject
> -o mynetworks=127.0.0.0/8
> -o smtpd_authorized_xforward_hosts=127.0.0.0/8
> -o smtpd_tls_security_level=none
> -o smtpd_data_restrictions=
You may be processing each message through your milters twice.
--
Viktor.
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