Harden Firewall

I have a Linksys RVO16 firewall, and need to lock down the SMTP.  I only want SMTP traffic to come in from the outside from a couple of IP ranges.  Can someone please tell me how to do this?  
PC4N6Asked:
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giltjrConnect With a Mentor Commented:
The manual is a bit hard to read,

 But it looks like you need to go to the Access Rule page and setup an access rule.

You want to allow traffic inbound from the WAN (source interface) and then specify what IP address you want to allow SMTP traffic inbound from.

It looks like you will need to define a unique Access Rule for each range you want to allow inbound e-mail from.

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