On 06/12/2025 11:45 pm, Bill Cole via Postfix-users wrote:
> Which indicates that GMail didn't even connect to attempt a delivery.

Yes, I agree. I have just checked iptables for the third time but found nothing for google in/out IPs that I know about (actually checking /16)...

108.177.16.0/24
108.177.17.0/24
142.250.220.0/24
142.250.221.0/24
74.125.224.0/24
192.178.223.0/24

Any others to look for?

> This suggests that the problem is in the DNS of the recipient domain(s), which I don't see stated clearly.

Failed mail to domains (that I know of)...

linkcheck.co.uk
instepdp.co.uk
schoolhistoryscene.co.uk
shropshireacupuncture.co.uk

> I don't see any problem with the relevant DNS for the visible domains. I don't see any reason for a sending server to not even attempt to give you mail for ssph.org.uk, bristolweb.net, or linkcheck.co.uk.

Nor me 🙁

> If you have a bounce message generated by GMail, it may provide more useful information.

Three bounce messages sent to me, all identical except for email address...

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Delivery incomplete
There was a temporary problem delivering your message to [email protected]. Gmail will retry for 45 more hours. You'll be notified if the delivery fails permanently.

The response was
The recipient server did not accept our requests to connect. For more information, go to (etc)
[mail.bristolweb.net, 185.35.148.156: timed out]
-----

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An earlier report to me stated that there was no bounce. We concluded that this (and a few more email losses) were due to the google outage as detailed here...

https://helm.news/2025-11-13/global-google-workspace-outage-nov-disrupted-gmail-drive-meet-hours.html
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Dave Stiles
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