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Lock down 1841 Router to Postini SMTP only

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  or  or through
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 any
  deny ip host any

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

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

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

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