How to limit incoming email to only come from a cloud spam provider

Question

I run a mac mini server for email 10.8
I am getting a lot of junk email that is bypassing spam blocking provider. I want to setup up on server, a rule to only receive mail on port 25 to come from a specific ip address. Older OS would let you set up easily.

Answer 1

Hi Iwan,
To restrict the number of calls to the application you need to configure only the appropriate number (10 in your example) of dial-peers to point to the AA Pilot number. Have a look;
Set Up Incoming Dial Peers for AA Pilot Numbers
In this task, you associate dial peers for incoming calls with the AA service that you want them to use.
Cisco Unified CME B-ACD is available for outside calls through voice ports and trunks, for which dial peers must be set up. When you set up a dial peer, you use the service command to associate it with the name of the Cisco Unified CME B-ACD AA service that you want callers to that dial peer to reach.
Note You must configure a dial peer for each incoming DID voice port.
To determine how many ports or trunks you must have for your Cisco Unified CME B-ACD service, consider the following:
Total number of phones across all ephone hunt groups
Total number of slots in the queues across all queues
Total number of PSTN ports feeding into the queues
The number of simultaneous calls that Cisco Unified CME B-ACD can handle is limited by the number of PSTN ports, but these ports may not always be in use. For example, you could have three queues with ten slots per queue, but configure only 10 ports instead of 30 because you do not expect the three queues to ever be full at one time.
From this good doc;
http://www.cisco.com/en/US/products/sw/voicesw/ps4625/products_configuration_guide_chapter09186a00805f2305.html#wp1003323
Hope this helps!
Rob