Hi Victor,
Thank you for diving into this topic.
Using a Milter is an option, but it often involves correlating information from
both the milter process and the log for a comprehensive view. For example,
capturing TLS details from both the smtp client process and smtpd pid, along
with recipient information and specific Headers is crucial. The proposed
configurable header key/value limit would simplyfy this process.
As far as I know, there are currently no other supported protocols for event
streaming. Therefore, relying on syslog (nearly real-time) or reading logs from
a file (with some delay) remains the most effective solution for obtaining
delivery information.
Best regards,
Matthias Schneider
----- Ursprüngliche Mail -----
Von: Viktor Dukhovni via Postfix-users <postfix-users@postfix.org>
An: postfix-users@postfix.org
Gesendet: Wed, 24 Jan 2024 16:38:05 +0100 (CET)
Betreff: [pfx] Re: Feature Request: Adjustable Header Log Size Limit in
INFO/WARN/REJECT Header_Check
On Wed, Jan 24, 2024 at 03:10:03PM +0100, Matthias Schneider via Postfix-users
wrote:
> Initially, I experimented with a Milter for logging the required
> headers, but I found that employing a larger %s printf value proved to
> be a more efficient solution. However, I'd like to point out that the
> default configuration for MaxMessageSize in rsyslog is often set to
> 8k, with the potential to increase it to 64k when using TCP.
> Therefore, the syslog aspect can handle larger messages effectively.
Why is syslog the right medium for accurate message header recording?
What sort of key/value pairs are you looking to extract from headers?
When ~2 decades ago I implemented header logging (actually MIME-skeleton
logging, that recorded also the header of all nested MIME parts), I
recorded the MIME skeletons of each message (separated by blank lines)
to a daily disk file. Syslog was not a good vehicle for faithful
recording of message metadata.
--
Viktor.
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