At 3:54 PM -0500 12/1/1996, John Buckman wrote:
>Perhaps someone can answer this question: do DNS servers cache MX
>records? Obviously, most DNS servers cache hostname->IP lookups, but
>I was wondering if they cached MX entries as well.
Yup. This is a standard feature of BIND.
>Or, are there any mailers (or patched mailers) which cache MX
>records? It seems like an obvious place to increase efficiency,
>especially with busy mailing lists, so I'd be suprised if some mailer
>(MTA) didn't do this.
I believe that sendmail already does this. That's why it takes
so long when starting up queue runners, especially in
"SortOrder=host" mode with version 8.7 sendmail. As I recall, Dan
Bernstein seems to think that doing something like this is a "bad
idea", and in qmail makes his goal the fastest possible start up of
queue runners without any pre-lookup at all. Blech.
--
Brad Knowles, MIME/PGP: brad@his.com
comp.mail.sendmail FAQ Maintainer <http://www.his.com/~brad/>
finger brad@his.com for my PGP Public Keys and Geek Code
The comp.mail.sendmail FAQ is at <http://www.his.com/~brad/sendmail/>
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