Re: qmail remote delivery logic

[Dave Sill]

Pavel Kankovsky <[EMAIL PROTECTED]> wrote:

>On Mon, 8 Nov 1999, David Dyer-Bennet wrote:
>
>> To start with, you have to do a HUGE number of extra DNS
>> lookups to determine what the recipient systems ARE.
>
>As opposed to the "one SMTP transaction per remote recipient" strategy
>that is able to deliver messages without the need to figure out what the
>recipient systems are? Intriguing. :)

Say you send a message to a list of 10,000 addresses using
sendmail. What's the first thing it does? It looks up the MX for each
recipient so it can sort by MX and minimize the number of connections.

qmail, on the other hand, fires off concurrencyremote qmail-remotes
and starts delivery immediately.

I think Postfix just sorts by FQDN, so it doesn't have to do 10,000
DNS lookups before it starts delivering. But by doing that, it
potentially misses a lot of combining for different FQDN's with the
same MX.

-Dave