On 2020-12-19 16:43, John Levine via mailop wrote:
In article <12329a9a-11a7-eda4-c88a-3dc352aea...@spamtrap.tnetconsulting.net>
you write:
On 12/18/20 12:29 PM, John Levine via mailop wrote:
As I recall some sites were getting stuck on the nolist host for
every message.
Odd.
Perhaps it has something to do with the type of nolisting. Did you have
something listening on the IP address? Or was it reserved with nothing
there?
I think it was sending resets but as I said, it was a while ago.
Back in the day, a number of servers were known to, uh, function
suboptimally when presented with various things.
I think the original unpatched qmail had one or two bits of weirdness
about MX lookups and limited retries. You might remember the details.
Exchange at one point was treating a "550" after a DATA as "hit me again
ASAP". In one case 1.5 million retries in 8 hours.
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