> If I have a domain, for example, example.com

hmm, I have that domain, too.

>...if they set up the domain in-house, and I change my DNS MX entries to 
>point to their mail server, for a day or two their e-mails will still be 
>routed to my mail server (until DNS propagates everywhere).

just before the modification of MX records, you lower the TTL on their MX 
records to  10 minutes.

>Will IMail automatically check the MX record and forward the e-mail to the 
>correct server

if imail is backup MX,yes

>or will it land on my server?

if their mail domain is no longer in your imail, Imail will reject that 
domain's mail.

>I know the instructions for Store and Forward say the MX record should be 
>pointing to the IMail server and their should be an entry in the HOSTS 
>file, which IMail will check then forward the mail. But this scenario is a 
>little different as the MX record will be changing, and I just need the 
>Store and Forward to happen until DNS propagates.

make MX short, and keep this operation simple.  you don't have to provide 
backup mx for them in the "propagation" time.

Len


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