However, I had an email forwarded from an external sysadmin yesterday about supposed problems in the way I'm interacting with a remote server that does "greylisting."
Here's an extract from that message:
"The mydomain.com MTA running at xx.xx.xx.xx is sending once and giving up on a TEMP-FAIL. Given its retry/queue behavior, sending to a busy server would result in a 'FAIL'. Strange.
The cause of the TEMP-FAIL is our very light greylisting.
The tuple {24.123.66.139,myuser_at_mydomain_dot_com,external_user_at_somewhere_else}
is unknown to (has never been seen by) our servers. [1] The
flow,
in pseudocode, would be (current config):
connect: {xx.xx.xx.xx.,myuser_at_mydomain_dot_com,external_user_at_somewhere_else}
if first-sighting then TEMP-FAIL
start four minute timer
start counting attempts
if seenB4 then
case
on OK list:
accept mail
in trial-period:
attempt++
if attempt > 4 then PERM-FAIL (DSN=5xx)
past trial time:
if not PERM-FAIL'd
upgrade tuple to OK
accept
This behavior has been present for at least six months.
[1] Approved Listings expire after a period. "
This makes it sound like I'm not responding appropriately to the temp-fail message, but I'm not aware that I've changed any Exim4 config params that would cause this. On the other hand, I don't even know what params those might be :-)
Is anyone familiar with this problem? Is there something I should change in my configuration to address it, or is the remote system simply being silly?
Thanks,
John
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