Question : I have a PIX 515 firewall and want to add a line which only allows Inbound emails from a particular IP address range

I have a PIX 515 firewall and want to add a line which only allows Inbound emails from a particular IP address range.

The company I work for have purchased the services of a Managed Anti-Spam and Anti-Virus service who scan emails for Spam and/or Viruses before they are forwarded to us. They require us to configure our firewall in order to ensure that any SMTP traffic coming through our firewall should be from them.

Could someone please send me an example of the line which I need to add to my current configuration.

I need to restrict incoming emails from only the IP address range 168.143.177.128 - 168.143.177.191 which has a subnet mask of 255.255.255.192.

If you require any further information, please let me know.

I look forward to a response soon.

Thank you.

Shiraz

Answer : I have a PIX 515 firewall and want to add a line which only allows Inbound emails from a particular IP address range

Hi.  I did--the weather is finally breaking here!  It sems like yours went well too.
Thank you for the points increase.  

As far as future questions, publishing the question is for everyone to see, and I've seen many excellent answers from patient people.  It's been fun, and I'll watch for your questions in the future.