Mail Setup help!

[JM]

hi,
	
this is my setup:

Internet ---- MAILSERVER (owned by sister company)
					|
					| ( LAN )
					|
			     Sendmail Box (FreeBSD) ( lies on our sister company's data center )
					|
					| ( LAN )
					|
				Qmail Box (Linux) ( lies on our data center )

currently all mails arrives at MAILSERVER. all mydomain.com is relayed to 
Sendmail box w/c is where all our mail boxes of mydomain.com users lies.

now i want to relay all mails relayed to Sendmail Box to be relayed to Qmail 
box.  can someone point me to a howto on this... 

info:
 i can eliminate Sendmail Box.. but i cant because i dont want our sister 
company to know that we are storing our mails inside our place.  because 
they'll be asking us to use our own internet pipe for mails.. hehehehe..


TIA
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