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Lock down 1841 Router to Postini SMTP only

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Last Modified: 2013-11-30
Working with a Cisco 1841 router, I want to lock down email to come from only Postini.
I see many solutions for PIX firewalls, but not just routers.
Postini is at 64.18.0.0/20  or 64.18.0.0 255.255.240.0  or 64.18.0.0 through 64.18.15.255
This router also handles a voip channel on a different subnet and physical port

What is working now - before locking it down:
ip access-list extended serial0/0/0
  permit tcp any host x.x.x.41 eq 3389
  permit tcp any host x.x.x..42 eq 3389
  permit tcp any host x.x.x.43 eq 3389
  permit tcp any host x.x.x.42 eq smtp
  deny ip host 255.255.25.255 any
  deny ip host 0.0.0.0. any

I have removed the permit.... smtp with a NO

I have tried to add:
  permit tcp 64.18.0.0 255.255.240.0 host x.x.x.42 eq smtp

What I get in response is:
  permit tcp 0.0.0.0 255.255.240.0 host x.x.x.42 eq smtp

help please - my syntax must be in error...
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