[exim] (host) incorrectly presented itself as....

Hello,

A quick problem with how my box identifies itself to remote servers
(wrong). Here is a quick example.

192.111.111.1 - hub.mydomain.com (1st ip on box)
192.111.111.2 - smtp.mydomain.com (exim)

Exim is configured to listen on 192.111.111.2 with:

local_interfaces = 192.111.111.2 : 127.0.0.1

Watching the mailog on a remote server, my server still presents itself
as hub.mydomain.com, yet I elho smtp.mydomain.com. This gives the
warning:

* Remote host 192.111.111.1 (hub.mydomain.com) incorrectly presented
itself as smtp.mydomain.com. *

Is there some other configuration option I need to set to exclusivity
use smtp.mydomain.com?

Thanks,
-J