At 5:43 PM +0100 2004-07-08, Ian A B Eiloart wrote:
Anyway, exim won't be queueing mail AFTER doing the VERP. Only the un-VERPED message gets queued.
Which is the point. Doing the VERP in Mailman means that multiple messages would get queued, one for each recipient. If you queue the message first and then do the VERP afterwards, that will avoid the synchronous meta-data update operations for all those additional recipients.
EXIM's philosophy is to avoid queueing messages if possible, because it is usually possible to deliver a message at the first attempt. Probably better than 99% likelihood for a typical mix of domains.
My experience is that 90-99% of initial delivery attempts are successful, which seems to match with the philosophy of Exim.
At least, I think that's the way it works. The strategy probably wouldn't work with an MTA like qmail which queues first and thinks later.
Which was my point behind the statement that this would depend on the MTA implementation.
Of course, this does assume that the MTA uses the same VERP format that Mailman would have used, otherwise Mailman is likely to get very confused. This may or may not pose a problem for you, but you should at least check to make sure that they both use the same formats.
Of course it does! The whole point of the recipe is to deliver Mailman like VERP without the overhead in handoff of messages from Mailman to the MTA.
But you've got to make sure that the VERP format is the same. And how do you deal with recipient addresses which are themselves VERPed? How do you take a VERPed recipient address and then VERP that for inclusion in the envelope sender address?
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