Hey all,
Have an odd one, has anyone seen a user of qq.com's email services
receiving actual NDRs for 4XX deferrals?
For example:
When a qq.com user attempts to send to <recipient> instead of the qq.com
MTAs treating the 4XX deferral as temporary from the recipient system
and retrying, they treat it as a permanent failure and immediately send
the qq.com user the equivalent NDR of what one would expect for a 5XX.
Just curious on if anyone's had experience with this behavior before.
- Mark Alley
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