Email migration and MX records

[Bruce Johnson]

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 tonight, doing the migration, changing our MX Records after to let the outside  know where its supposed to send us email and then changing the delivery address we have on Barracuda to the new one, and the mail should flow in.

In theory! :-)

Thanks for all the suggestions, everyone.


On Jan 6, 2023, at 12:52 PM, Mark Andrews <marka at isc.org<mailto:marka at isc.org>> wrote:

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 <wbrown at e1b.org<mailto:wbrown at e1b.org>> wrote:

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 <bind-users-bounces at lists.isc.org<mailto:bind-users-bounces at lists.isc.org>> On Behalf Of Marcus Kool
Sent: Wednesday, January 4, 2023 7:17 AM
To: bind-users at lists.isc.org<mailto:bind-users at lists.isc.org>
Subject: Re: Email migration and MX records

******** This email originated from outside of the organization. Use caution when replying, opening attachment(s), and/or clicking on URL's. ********


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).

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--
Bruce Johnson
University of Arizona
College of Pharmacy
Information Technology Group

Institutions do not have opinions, merely customs

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