Am 04.09.23 um 15:16 schrieb Ulf Zibis:
Am 04.09.23 um 14:59 schrieb Reindl Harald:
Am 04.09.23 um 14:35 schrieb Ulf Zibis:
because of a domain relocation, my email was not reachable from
2023-09-01 13:54 UTC to 2023-09-04 11:38 UTC.
because it takes time?
the interval of retries increases as it makes no sense trying every 5
minuts
OK, so I can hope until 2023-09-04 13:54 UTC for a last retry ?
it depends on the sending server how long it will retry
for one moron which don't manage a server relocation
The moron, who made a typo on the dns records, was the webhosting
provider, and on weekend he was not reachable.
well, don't do changes you can't do alone in front of a weekend
seriously - the expected downtime is seconds to minutes when properly
planned even for thousands of accounts
* new system online
* DNS TTL down to 5 minutes
* imapsync
this took 16 hours, so little more than 5 minutes
irrelevant - this is the first sync so that finally only the diff of the
new messages needs to be transmitted
years ago i migrated a few hundret domains with around 150.000 messages
with exactly 20 seconds downtime
* take down the MTA on both sides
What is MTA?
oh my god - and you are operating a mailserver? - that little to no
knowledge about mail explains the naive question about resend list mails
https://en.wikipedia.org/wiki/Message_transfer_agent
the idea is to make sure no new mails arrive on both sides while the
final message sync is running and finally turn only the new one up
so delivering MTA's with outdated DNS infos fail on the old one and the
next retry happens on the new server
while the sync is running no messages are accepted at all which is no
problem given that any serious mail system retries anyways
* change dns record
* final imapsync
* start MTA
* done
And thanks for the recipe ... for the next time
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