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 postfix be willing to implement something like this? At a minimum, it might be useful to use this to indicate that a milter application requested that a message be quarantined until an operator released it. Thanks, -MSK
