[BlueOnyx:03223] problem with email sending as local.localdomain

[chris at aleadingedge.com]

Please Help
I have only been using blueonyx for about a week now and can't get past one
hurdle and i can't find any documentation on my problem.
im trying to use this package to replace Zimbra and what i want to do is setup
this server to host email for two domains. the main server fqdn is
mta.leadingedgewireless.com so i setup two virtual sites mail.mylew.net and
mail.leadingedgewireless.com i can send email and receive email BUT when i send
email from either domain it is sent as username at mta.leadingedgewireless.com so i
changed the main server to localhost.localdomain and now it sends emails from
either domain as username at localhost.localdomain. so im trying to figure out how
to make the virtual site send email as IT's Domain name not the primary servers
domain name i hope this is enough information
Thanks
Chris