On Fri, 23 Jun 2023, Carsten Schiefner via mailop wrote:
Hi, Luke (& all) -
how about elaborating a bit further on the whats and whys of your setup?
Because at first sight it is indeed a bit hard to understand why SendGrid may
not be in a position to follow the RFCs and the thereof derived and sort of
well-established practices of handling server responses.
This might actually take a bit of heat out of this thread.
And after all, noboy here is really already at the top of their learning curve
as I'd assume - and so additional knowledge is quite likely welcome.
Luke did give us some examples of what he is up against in February,
on the thread "Gmail blocking of good customer"
https://list.mailop.org/private/mailop/2023-February/thread.html
The first message in this long thread (50+ messages) is
https://list.mailop.org/private/mailop/2023-February/024397.html
and Luke made about six contributions.
Perhaps the most pertinent one was
https://list.mailop.org/private/mailop/2023-February/024461.html
where Luke said:
4.1.1 Recipient Address Rejected: this one is tough because with some
MXs retries result in delivery, in others, it's a dead end. Dynamic
rule handling per receiving MX would be awesome, but it would require
machine learning to accomplish at scale.
which Michael Orlitzky suggested
https://list.mailop.org/private/mailop/2023-February/024463.html
might be because of "postfix's unverified_recipient_reject_code".
I would think that considering the MX when overriding the response code
would be a worthwhile addition to try, whether the machine learning
is AI-based or hard coded.
--
Andrew C. Aitchison Kendal, UK
and...@aitchison.me.uk
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