On Wed, Jun 11, 2025 at 03:35:07PM +0000, Pedro David Marco via Postfix-users
wrote:
> I have tried setting smtpd_timeout = 60s but this only controls
> per-command timeouts, and it doesn't ensure disconnection after some
> idle time.
That's not true. I configured a loopback SMTP listener on port 24, and
with that I see:
$ time perl -MIO::Socket -e '
my $s = IO::Socket::INET->new(PeerHost => "127.0.0.1", PeerPort => 24)
or die "connect: $!\n";
$s->autoflush(1);
print $s->getline();
print $s qq{EHLO amnesiac.local\r\n};
while(my $l = $s->getline()) { print $l };'
220 amnesiac.local ESMTP Postfix
250-amnesiac.local
250-PIPELINING
250-SIZE 157286400
250-ENHANCEDSTATUSCODES
250-8BITMIME
250-DSN
250-SMTPUTF8
250 CHUNKING
421 4.4.2 amnesiac.local Error: timeout exceeded
real 0m3.028s
user 0m0.013s
sys 0m0.002s
When a remote client is idle for more than $smtpd_timeout Postfix
drops the connection with a "421" response as seen above.
--
Viktor.
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