[pfx] Re: Trying to limit the number of users per connection and the number of concurrent connections to one domain

[Paul Tomblin via Postfix-users]

On Sat, Jun 27, 2026, at 11:08 AM, Paul Tomblin via Postfix-users wrote:
> On Sat, Jun 27, 2026, at 9:55 AM, Wietse Venema via Postfix-users wrote:
>
>> You may want to specify slow_smtp_destination_rate_delay to slow things 
>> further down.
>
> Ok, I made that one change (set it to 3s), did a postfix reload, and 
> now they've all got the process id, but the delay= changes every 5. 
> After the 2nd batch of 5, all the subsequent batches were deferred 
> (server temporarily unavailable). But it seems like when it retried, 
> the 3rd and 4th batches went through with delay=490 and delay=493 
> respectively, but everything else delayed again.
>

Oh, I spoke too soon. It appears after 4 retries, the final 19 of the members 
bounced. That's frustrating, because that looks like it's 
RoadRunner/Charter/Spectrum that's doing that.

2026-06-27T15:24:59.818522+00:00 mail postfix-slow/smtp[1587226]: D9D1182A6E: 
to=<xxx...@rochester.rr.com>, 
relay=pkvw-mx.msg.pkvw.co.charter.net[47.43.26.7]:25, delay=2293, 
delays=2290/2.8/0.33/0.13, dsn=5.1.0, status=bounced (host 
pkvw-mx.msg.pkvw.co.charter.net[47.43.26.7] said: 550 5.1.0 96.126.110.20 
blocked. Please see 
https://www.spectrum.net/support/internet/understanding-email-error-codes for 
more information. AUP#In-1300 (in reply to MAIL FROM command))
2026-06-27T15:24:59.819040+00:00 mail postfix-slow/smtp[1587226]: D9D1182A6E: 
to=<xx...@rochester.rr.com>, 
relay=pkvw-mx.msg.pkvw.co.charter.net[47.43.26.7]:25, delay=2293, 
delays=2290/2.8/0.33/0.13, dsn=5.1.0, status=bounced (host 
pkvw-mx.msg.pkvw.co.charter.net[47.43.26.7] said: 550 5.1.0 96.126.110.20 
blocked. Please see 
https://www.spectrum.net/support/internet/understanding-email-error-codes for 
more information. AUP#In-1300 (in reply to MAIL FROM command))
--etc--


-- 
Paul Tomblin
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