y, January 4, 2023 7:17 AM
To: bind-users@lists.isc.org<mailto:bind-users@lists.isc.org>
Subject: Re: Email migration and MX records
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> William Brown
> WNYRIC/Erie 1 BOCES
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> -Original Message-
> From: bind-users On Behalf Of Marcus Kool
> Sent: Wednesday, January 4, 2023 7:17 AM
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migration and MX records
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SMTP is a wonderful protocol that queues messages and retries delivery for 5
days so a non-responsive email server is no
Bruce Johnson via bind-users wrote:-
>Were making an O365 tenant switchover for our domain (a subdomain of the
>arizona.edu domain) and moving from our Barracuda cloud email SMTP to the
>Universitys tenant, but email cannot flow until the Arizona.edu O365 tenant
>can take over our email doma
Bruce, I would push back and ask for more information from whomever is
leading you down that path as it does not sound right to me although others
more familiar with DNS magic might have better suggestions to DNS changes.
But if Barracuda is just a front-end for email that does antivirus/spam
filte
SMTP is a wonderful protocol that queues messages and retries delivery for 5
days so a non-responsive email server is no issue.
Just do not have a temporary solution that bounces emails since those will
never arrive (the sender is notified about the bounce).
Marcus
On 03/01/2023 21:31, Bruce J
Hi Bruce,
It would be better to have an SMTP server return 421 "4.3.0" or 421 "4.7.0"
while the migration is under way instead of bouncing the connection. 421 will
tell all SMTP servers everywhere to "try again later". The 421 error is a
proven greylisting configuration.
Not knowing what is
Hi Bruce,
This is something I'm presently battling with as well. My current previously
tested plan is:
1. Create all user accounts (with NEW email addresses) on the new email system
2. Setup a temporary forwarder on an existing *temporary* email server (we use
hMail) which forwards all email se
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