Hi,
I'm co-authoring a draft that would add supplementary information to Received header fields indicating when a message enters some kind of administrative hold. This would be useful to people looking through trace data to figure out why a message sat on a machine for some time, if the reason is something other than a hop that took a long time to complete for connectivity reasons.
The draft specification is here:
https://datatracker.ietf.org/doc/draft-kucherawy-received-state/
Would exim be willing to implement something like this? It may be that you have no processing modes or responses like "quarantine" that would apply so maybe it's not applicable at all, but it's worth it to ask.
Thanks,
-MSK
