Outbound Hostname

[Peter Woods]

I am having some difficulty getting qmail to send
outbound email with the CNAME of the system rather
than the actual hostname.  I have modified me
and defaulthost files in /var/qmail/control to
include the CNAME of the system.  The hostname
is only referenced in the rcpthosts file.  Any
hints where I might proceed to get this fixed?
I have even tried the FAQ example to send outbound
email with just the domain, and that does not work
either.