Few virtual mail domains work fine. How about SMTP?

Hello,
Following detailed advices here we have successfully set up our mail server to support our several domains (e.g. company.com, company.net, company.co.uk, etc), however all emails are being sent from one same SMTP address (mail.company.com) and not from respective addresses (mail.company.net, mail.company.co.uk) as we wanted.
We tried using those SMTP virtual servers above (mail.company.net, mail.company.co.uk, etc) in users' mail clients but for some reason they won't resolve to our server. Maybe it is a DNS thing? Currently we have one zone and it is for company.com. Adding additional zone for company.net didn't help. Moreover I am not sure it is the right thing to do as all zones MX will point to the same local IP?
Anybody can shed some light on our problem please?
PS: Latest updated Leopard Server, domains were added as virtual. Receiving and sending of mail works perfect except for the fact that long headers in email itself contain 'wrong' address of SMTP server.

Alex, thanks for your reply.
I will try with what I want to achieve.
1. Company has 3 domain names (one.com, two.com, three.com)
2. Leopard server has been setup with mail.one.com being main domain whereas mail.two.com and mail.three.com are virtual.
3. When users of two.com and three.com send emails from their email clients, long headers will show mail.one.com as the SMTP server.
Q: Is it possible to configure Leopard server so that emails sent from two.com and three.com accounts will have SMTP server mail.two.com and mail.three.com respectively in their long headers?
PS: we currently have 1 public static IP address and 1 Leopard server. If this task is unachievable with single server we will consider buying more IPs and more servers as being an owner of all three domains company wants to separate mail from them completely.

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