Paul Tomblin via Postfix-users:
> 2026-06-26T17:58:25.865845+00:00 mail postfix/smtpd[1046517]: disconnect from 
> localhost[::1] ehlo=1 mail=1 rcpt=489 data=1 quit=1 commands=493
> 2026-06-26T17:58:26.784276+00:00 mail postfix-slow/smtp[1046598]: 89A2C82E43: 
> [email protected]>, relay=pkvw-mx.msg.pkvw.co.charter.net[47.43.26.7]:25, 
> delay=1.2, delays=0.3/0.05/0.35/0.52, dsn=2.0.0, status=sent (250 2.0.0 
> dAorwNQVCzLiadAoswI9Zm mail accepted for delivery)
> 2026-06-26T17:58:26.784455+00:00 mail postfix-slow/smtp[1046598]: 89A2C82E43: 
> [email protected]>, relay=pkvw-mx.msg.pkvw.co.charter.net[47.43.26.7]:25, 
> delay=1.2, delays=0.3/0.05/0.35/0.52, dsn=2.0.0, status=sent (250 2.0.0 
> dAorwNQVCzLiadAoswI9Zm mail accepted for delivery)
> 2026-06-26T17:58:26.784528+00:00 mail postfix-slow/smtp[1046598]: 89A2C82E43: 
> [email protected]>, relay=pkvw-mx.msg.pkvw.co.charter.net[47.43.26.7]:25, 
> delay=1.2, delays=0.3/0.05/0.35/0.52, dsn=2.0.0, status=sent (250 2.0.0 
> dAorwNQVCzLiadAoswI9Zm mail accepted for delivery)
> 2026-06-26T17:58:26.784576+00:00 mail postfix-slow/smtp[1046598]: 89A2C82E43: 
> [email protected]>, relay=pkvw-mx.msg.pkvw.co.charter.net[47.43.26.7]:25, 
> delay=1.2, delays=0.3/0.05/0.35/0.52, dsn=2.0.0, status=sent (250 2.0.0 
> dAorwNQVCzLiadAoswI9Zm mail accepted for delivery)
> 2026-06-26T17:58:26.784611+00:00 mail postfix-slow/smtp[1046598]: 89A2C82E43: 
> [email protected]>, relay=pkvw-mx.msg.pkvw.co.charter.net[47.43.26.7]:25, 
> delay=1.2, delays=0.3/0.05/0.35/0.52, dsn=2.0.0, status=sent (250 2.0.0 
> dAorwNQVCzLiadAoswI9Zm mail accepted for delivery)

That's five recipients with PID=1046598 and delays=1.2

> 2026-06-26T17:58:26.842854+00:00 mail postfix-slow/smtp[1046597]: 89A2C82E43: 
> [email protected]>, relay=pkvw-mx.msg.pkvw.co.charter.net[47.43.26.7]:25, 
> delay=1.3, delays=0.3/0.04/0.4/0.53, dsn=2.0.0, status=sent (250 2.0.0 
> dAoswSd8lLkK9dAoswwv67 mail accepted for delivery)
> 2026-06-26T17:58:26.842962+00:00 mail postfix-slow/smtp[1046597]: 89A2C82E43: 
> [email protected]>, relay=pkvw-mx.msg.pkvw.co.charter.net[47.43.26.7]:25, 
> delay=1.3, delays=0.3/0.04/0.4/0.53, dsn=2.0.0, status=sent (250 2.0.0 
> dAoswSd8lLkK9dAoswwv67 mail accepted for delivery)
> 2026-06-26T17:58:26.843016+00:00 mail postfix-slow/smtp[1046597]: 89A2C82E43: 
> [email protected]>, relay=pkvw-mx.msg.pkvw.co.charter.net[47.43.26.7]:25, 
> delay=1.3, delays=0.3/0.04/0.4/0.53, dsn=2.0.0, status=sent (250 2.0.0 
> dAoswSd8lLkK9dAoswwv67 mail accepted for delivery)
> 2026-06-26T17:58:26.843078+00:00 mail postfix-slow/smtp[1046597]: 89A2C82E43: 
> [email protected]>, relay=pkvw-mx.msg.pkvw.co.charter.net[47.43.26.7]:25, 
> delay=1.3, delays=0.3/0.04/0.4/0.53, dsn=2.0.0, status=sent (250 2.0.0 
> dAoswSd8lLkK9dAoswwv67 mail accepted for delivery)
> 2026-06-26T17:58:26.843168+00:00 mail postfix-slow/smtp[1046597]: 89A2C82E43: 
> [email protected]>, relay=pkvw-mx.msg.pkvw.co.charter.net[47.43.26.7]:25, 
> delay=1.3, delays=0.3/0.04/0.4/0.53, dsn=2.0.0, status=sent (250 2.0.0 
> dAoswSd8lLkK9dAoswwv67 mail accepted for delivery)

That's five recipients with PID=1046597 and delays=1.3.

> 2026-06-26T17:58:27.203545+00:00 mail postfix-slow/smtp[1046598]: 89A2C82E43: 
> [email protected]>, relay=pkvw-mx.msg.pkvw.co.charter.net[47.43.26.7]:25, 
> delay=1.6, delays=0.3/0.92/0.33/0.08, dsn=4.1.0, status=deferred (host 
> pkvw-mx.msg.pkvw.co.charter.net[47.43.26.7] said: 452 4.1.0 
> <[email protected]> server temporarily unavailable 
> AUP#In-1390 (in reply to MAIL FROM command))

You may want to specify slow_smtp_destination_rate_delay to slow things further 
down.

        Wietse
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