On Thu, Oct 08, 2020, Harald Dunkel wrote:
> Lines with a message id, and lines without. Very painful.
Maybe that's because there are sessions and transactions in SMTP.
Only the latter belong to a specific message, the former can
contain multiple transactions, so logging a specific message id
for them is somehow wrong (unless you restrict the MTA to
perform only one transaction per session).
PS: some MTAs have/log ids specific to each part of the protocol:
session, transaction, recipient (and even specific to the server
and client side if needed).