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Message-ID: <19b0b1ad-e249-4de1-8f81-e4f95ba62455@SystematicSW.ab.ca>
Date: Thu, 16 Oct 2025 15:22:32 -0600
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Subject: Re: Has there been a mailing list outage revently?
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From: Brian Inglis via Cygwin <cygwin AT cygwin DOT com>
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On 2025-10-16 02:03, Duncan Roe via Cygwin wrote:
> On Wed, Oct 15, 2025 at 05:56:48AM -0600, cygwin wrote:
>> On 2025-10-14 16:36, Backwoods BC via Cygwin wrote:
>>> On Tue, Oct 14, 2025 at 3:25 PM Duncan Roe via Cygwin wrote:
>>>> This is the first email I've received from cygwin since Mon, 13 Oct 2025
>>>> 04:03:05 GMT. That's when I sent an email to the list which didn't come back and
>>>> isn't in the archive. (There's only 1 email from 13 Oct in the archive,
>>>> https://cygwin.com/pipermail/cygwin/2025-October/258880.html sent at 06:48:00
>>>> GMT).

>>>> If I see this email come back, I can re-send the 2 missing ones, otherwise ...??

>>> I was dropped by the list server a year or so ago and had to
>>> re-subscribe. No reason that I was able to determine. A sample size of
>>> 1, but it does happen.

>> Happened to me a number of times when my email providers took too long to
>> process/bounced incoming email, or had inadequate DKIM, DMARC, SPF
>> authentication records for their or my domains:
>> 	https://www.cloudflare.com/en-gb/learning/email-security/dmarc-dkim-spf/

> This is getting weird. I re-sent the 2 messages and they didn't get to cygwin
> *again*. I guess some pattern in their content must be triggering cygwin's spam
> filter. I'm contemplating sending them as gzipped attachments - does anyone know
> if the spam filter unzips those and checks them anyway?

Could it be due to Oz or Optus limits, rules, or policies about content?

https://www.optus.com.au/support/answer/can_t_send_or_receive_email_optusnet_troubleshooting_2084

https://www.optus.com.au/for-you/support/answer?id=20316

https://www.optus.com.au/content/dam/optus/appendix/Appendix%20S/AppS.doc

I've seen stuff happen with personal ISP local emails to family being blocked 
from sending, or delayed hours by outsourced US-based miltering provider.

-- 
Take care. Thanks, Brian Inglis              Calgary, Alberta, Canada

La perfection est atteinte                   Perfection is achieved
non pas lorsqu'il n'y a plus rien à ajouter  not when there is no more to add
mais lorsqu'il n'y a plus rien à retrancher  but when there is no more to cut
                                 -- Antoine de Saint-Exupéry

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