Yoda via Postfix-users:
> One question I want to ask separately from the syntax case before we
> lock in our tuning rules:
>
> In the 2026-05-04 incident, the mx1 stall occurred after a batched
> postconf change that included:
>
> default_destination_rate_delay = 0
> smtp_destination_rate_delay = 500ms
> default_destination_concurrency_limit = 8
> default_destination_recipient_limit = 100
>
> "500ms" is valid integer + ms suffix per time(5), so I would not
500ms IS NOT valid Postfix syntax.
As documented:
To enable the delay, specify a non-zero time value (an integral value
plus an optional one-letter suffix that specifies the time unit).
Time units: s (seconds), m (minutes), h (hours), d (days), w (weeks).
The default time unit is s (seconds).
> Under sustained load with many active recipient destinations
> (hundreds) and a backed-up queue, is sub-second
> default_destination_rate_delay (e.g. "500ms", valid integer + ms
> syntax, set at the default level only) safe?
It is an INVALID configuration. It is therefore not safe from a
mail delivery performance point of view.
Wietse
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