>We had our zone file modified so that the A record for WWW points to that
>machine

ok

>and [and I understand that this is where the difficulty lies] we
>also changed the A record for the domain itself to point to that machine as
>well.

ok

>That machine is also running IMail as it turns out, just not for us.

no problem

>Here's my question: if mail destined for users in my domain hits that
>machine through whatever DNS process, it gets refused.

Of course, that Imail doesn't know about your domain, your mail will 
be rejected.

>Besides changing that domain A record back to point to my mailserver

why do that?

>how else can we fix things

what's broken?

>so that I don't lose any mail?

Are you losing mail?

Mail follows the MX record(s) for a domain, not the A record. Keep 
you MX(s) running, and you won't lose mail.

>I'd like not to add an MX record for that machine

Your mail is not hosted on that machine.

>because I'm not trying to encourage any mail to go to that box,

no, your mail is not hosted on that machine.

>  but neither do I want them to refuse any.

???  If you keep your MX(s) running for you domain, your mail won't 
go to your domain's A record.

Keep your A record over there (if you want your visitors to visit 
http://domain.com).

What you might do is see if your new web server's Imail can be 
secondary MX for your own Imail.

Len


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