Thomas Landauer via Postfix-users:
> Since you're creating the queue ID only after `RCPT TO`, we have the
> sender's and the main recipient's address at hand - that would be enough
> to set up something like a `queue_id_prefix_map` :-)
First, the queue ID is not the place for this information. This
would require a new tag field in logfile messages, plus a new
mechanism to assign such tags (see also 'fourth' below). Queue IDs
are the names of files that are manipulated with postsuper and
postqueue. Queue IDs are exposed in Message-ID headers and in
delivery status notifications that may be sent to external senders,
and it is none of their business to find out what names you choose
to tag your email streams.
Second, if you can 'map' a (sender and/or recipient) to an email 'message
class' (news, invoice, etc.) while Postfix receives mail, then you
can do that mapping outside Postfix while processing the logfile
stream. (As a matter of principle, if a niche application like
your mapping can be implemented outside Postfix, then that is better
than bloating up Postfix with something that almost no-one else
will use).
Third, if you can do that message class mapping ahead of time, in the
form of a DSN envelope ID, then you should consider using that. Just
turn off DSNs for the SMTP client, and your Postfix system will
inform the sender whether or not delivery was successful.
Fourth, requests to tweak logs are better solved by making Postfix
logging configurable.
Wietse
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