On Mon, May 11, 2026 at 10:29:38AM +0200, Gerben Wierda via Postfix-users wrote:
> I get two of these from double-bounce@ <mymailserver>
>
> From: Mail Delivery System <MAILER-DAEMON@<mymailserver>>
> To: Postmaster <postmaster@<mymailserver>>
> Subject: Postfix SMTP server: errors from unknown[101.47.29.67]
$ postconf notify_classes
> In: MAIL FROM:<[email protected]>
> Out: 452 4.3.1 Insufficient system storage
$ posconf queue_minfree message_size_limit
queue_minfree (default: 0)
The minimal amount of free space in bytes in the queue file system that
is needed to receive mail. This is currently used by the Postfix SMTP
server to decide if it will accept any mail at all.
By default, the Postfix SMTP server rejects MAIL FROM commands when the
amount of free space is less than 1.5*$message_size_limit (Postfix ver‐
sion 2.1 and later). To specify a higher minimum free space limit,
specify a queue_minfree value that is at least 1.5*$message_size_limit.
With Postfix versions 2.0 and earlier, a queue_minfree value of zero
means there is no minimum required amount of free space.
--
Viktor. 🇺🇦 Слава Україні!
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