>Setup Imail on a new box with an official hostname of "cshore.com".

and a mail host alias of mail.cshore.com, can't hurt

>The actual hostname is "mail.cshore.com" in DNS.

Two different names and functions. Call it the DNS hostname whatever 
you want in whatever domain you want.

>In appears that users have a reply address of "[EMAIL PROTECTED]" 
>BUT can log in with "username" only.
>I'm not running IIS on the box so I have changed the port for webmail to
>"80". So users can check their mail http://mail.cshore.com  and just type in
>their username, without the "@domain.com"

why not call it something more articulate:

@        MX    mx2000.cshore.com.   ; mail servers send mail here
                                     ; for the 2000 users.
mail     MX    mx2000.cshore.com.   ; ditto
;
pop      A     ip.ad.re.ss      ; 2000 users read mail here
smtp     A     ip.ad.re.ss      ; 2000 users send mail here
webmail  A     ip.ad.re.xx      ; 2000 users do webmail here

>I will only run a single domain on this box.

That's the only way you can drop the fully qualified login, without 
@domain.com. All virtuals need the fully qualified account name.

>I'm just double checking so the
>move goes without any problems. Does anyone see any potential problems ?

no.   Before the switch, reduce your TTL on that zone from 1d to 1h, 
let a day pass to less cached records expire, do the switch, raise 
the TTL to 1d.

Len


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