At 3:52 PM +0100 2004-07-08, Ian A B Eiloart wrote:
The MTA does need to VERP remote deliveries, and that means making callouts to remote machines for each recipient. However, exim will use a single connection for each remote host - rather than one per recipient. So, exim has to send the data several times, but it doesn't have to read the data several times.
The real cost here is not reading the data several times, or making several remote connections when one would have sufficed -- proper connection caching and queue sorting would have solved the latter problem anyway.
No, the real cost here is the extra queue entries that the MTA would have to make for each of the VERPed recipients as received by Mailman, as opposed to being able to make just one queue entry and allowing the MTA to VERP the recipients itself.
Synchronous meta-data updates are the single biggest performance limiter for MTAs, assuming you have configured the rest of the mail server correctly.
Yes, it will. There would not have been much point doing it otherwise. The ONLY change to the Mailman configuration there is VERP_DELIVERY_INTERVAL. The exim recipe does the
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.
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