Re: qmail remote delivery logic

[Dave Sill]

Steve Vertigan <[EMAIL PROTECTED]> wrote:

>Dave Sill wrote:
>
>> 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.
>
>Why is that?  Lets say you have to deliver to [EMAIL PROTECTED], [EMAIL PROTECTED] and
>[EMAIL PROTECTED]  Why wouldn't a well-written mta assume that the MX for
>aol.com is most likely going to be the same as for aol.com, and aol.com?  If
>the MX lookup is done after sorting by domain wouldn't that reduce dns
>traffic?

Of course, I didn't mean to imply that identical FQDN's needed
multiple lookups.

-Dave