Re: [Sheflug] sendmail & cannons

[xxxxx [at] xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx]

On 22 Jan 2002 20:42:16 +0000
Alex Hudson <home [at] alexhudson.com> wrote:

> On Tue, 2002-01-22 at 20:28, Andrew Basterfield wrote:
> Can someone explain the action of the sendmail FEATURE('nocanonify')?
> 
> It does reverse look-ups on IP addresses (canonify, that is ;) - it
> returns the 'canonical name', hence canonifying. nocanonify turns this
> off.

Ah. Yes. My fa

> Did you want to know all that lot ? :)

Err... thanks anyway but that wasn't what I was getting at. Maybe I should
explain better.

OK I want to send mail to bob [at] lostgeneration.freeserve.co.uk

The MX record for lostgeneration.freeserve.co.uk is mail-in.pol.net.uk

mail-in.pol.net.uk has IP 195.92.193.155

doing "host 195.92.193.155" returns "slb-mail-inM1.svr.pol.co.uk" which is
the canonical name, right?

So does it make any difference to sendmail's operation if it is talking to
mail-in.pol.net.uk or slb-mail-inM1.svr.pol.co.uk? Why does sendmail
canonify hosts in the first place and why is it not recommended to turn it
off?

thanks

A. Basterfield
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