Alessandro Vesely <[EMAIL PROTECTED]> writes:
> [ ... ]
>
> Not only Courier has to discard the old message, but it has to accept
> a new one. Perhaps, the "resubmit path" can be optimized slightly?
> Anyway, it will remain a technique suitable for setups where messages
> are modified in a few cases only.
>
> [ ... ]
I'd just like to inject some more food for thought into this discussion.
A year or so ago, I submitted a patch to include Courier's queue ID into
the "Received:" header that Courier writes into a message. The purpose
of this was to aid in the modification of messages during filtering.
The way I envision this working is as follows:
Step 1: A message arrives and is fed through a courierfilter.
Step 2: The filter decides that the message needs to be modified in some
way, so it writes some information into a database that
describes the modifications to the message, using the queue ID
as a key. For example, this database might be some sort of dbm
file.
Step 3: The courierfilter then accepts the message, as is.
Step 4: Later in the message delivery chain, this same message is routed
through maildrop. At this point, the message can be modified.
Step 5: A maildrop recipe uses this same queue ID to look into the
database mentioned above. If it finds modification instructions
that are keyed to this queue ID, it alters the message in the
way that the instructions stipulate, and then it delivers the
message or passes it on for further filtering.
Although this is a multi-step process that requires cooperating
courierfilters and maildrop recipes, it doesn't require any changes to
Courier's current message-delivery procedure.
The queue ID is the field within the first "Received:" header that looks
like "id 080DDC27.45A9E14A.0000755B". It's guaranteed to be unique
during all steps along the message delivery chain for any given message.
--
Lloyd Zusman
[EMAIL PROTECTED]
God bless you.
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