Last I saw, both M365 and Google only retry for 24 hours before returning as
undeliverable.
--
William Brown
WNYRIC/Erie 1 BOCES
-Original Message-
From: bind-users On Behalf Of Marcus Kool
Sent: Wednesday, January 4, 2023 7:17 AM
To: bind-users@lists.isc.org
Subject: Re: Email migrati
DNS Servers that do not properly support or properly ignore DNS cookies and
instead return FORMERR is annoying. This is not new. However I have been seeing
more or perhaps just have more users that are finding more domains that are
hosted on authoritative servers with this unfortunate behavior.
Just a reason to not use them for your email. Not everybody is in a position
to repair stuff on a 7/24/365 basis. Notify that the mail is delayed by don’t
bounce.
--
Mark Andrews
> On 7 Jan 2023, at 06:11, Brown, William wrote:
>
> Last I saw, both M365 and Google only retry for 24 hours be
Really there are very few servers that are broken and the numbers are
decreasing. They are well under 1%. Just contact the few remaining server
operators and inform them that they are broken. It should just be an upgrade
to the current version to fix.
The behavior for unknown EDNS options wa
No one realistically has a choice about dealing with either for email.
In any case, we found a vastly simpler way of doing this; our cloud email
security/anti-spam provider (Barracuda) can spool mail for delivery if our
systems go offline for up to 96 hours, so we’re setting them to not deliver
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