>We have the useless mail.ourdomains.com you reference set-up on our
>servers as we followed the IMail docs suggestion during original
>configuration.

yes, Imail doc is simply wrong about putting mail.domain.com into Imail or 
into DNS.

>What are the best steps to make a change?

In Imail, remove mail.domain.com, and use domain.com as the single default 
hostname.

>1. Request DNS MX record change from mail.domain.com to domain.com.

in DNS:

;the MX hostname doesn't have to be the same as the domain.com name:

domain.com. mx 10  mx1.something.com.
domain.com. mx 20  mx2.whatever.com.

smtp.domain.com. A ip.ad.re.ss  ; clients send outbound here
pop.domain.com. A ip.ad.re.ss
imap.domain.com. A ip.ad.re.ss
webmail.domain.com. A ip.ad.re.ss

All the ip's above are the Imail ip's initially.

Then when you add IMGate, you simply change the ip of smtp.domain.com from 
ip of imail to ip of imgate.  The users don't have to change or know 
anything.

If they were running SMTP AUTH with Imail, no problem because IMGate won't 
announce AUTH, so the mail client programs "should" not attempt it.  They 
will relay mail to smtp.domain.com and it will go through.

Len


http://MenAndMice.com/DNS-training
http://BIND8NT.MEIway.com : ISC BIND for NT4 & W2K
http://IMGate.MEIway.com  : Build free, hi-perf, anti-abuse mail gateways


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