ASA 5520 DMZ Configuration Question

I have a general DMZ configuration question.

I have two networks:

DMZ - 192.168.155.0 /24
Inside - 172.22.0.0 /16

Here is what I have done:

static (Inside,DMZ) 172.22.0.0 172.22.0.0 netmask 255.255.0.0
global (Outside) 10 interface
global (DMZ) 10 interface
nat (Inside) 10 0.0.0.0 0.0.0.0
nat (DMZ) 10 0.0.0.0 0.0.0.0

So right now I have this:
- DMZ can access the internet
- 172.22.x.x network can access DMZ across all ports

How can I restrict access into the DMZ from the Inside so only port 25 is open from the Inside to the DMZ? or port 21 ex...
I have seen examples where the static command lists only the IP of the Inside host and not the entire range.  The problem is, I have a device
that would need to be accessed by all users in the 22 network over a specified port, not a single host.

Thanks in advance.

Nick