Using x.com on LAN when authoritative NS on inet

[hobosalesman at gmail.com]

Kevin Darcy wrote:
> You don't really have much of a choice here, since MX records apply to
> the "domain" part of a mail address (everything after the @-sign). You
> can't use MX'es to redirect individual mailboxes to different destinations.

Could I have one MX record for *@lanmail.x.com that goes to my LAN
server, and another MX record for *@x.com that goes to my hosts mail
server? Would that work?