SPAM filter setting for CRES secure e-mail

I am using Ironport strictly as an outgoing e-mail encryption engine. We use a different incoming spam filter (Barracuda). I would like to be able to go to the CRES site and send an encrypted message to our internal domain so users can establish their CRES credentials. However, the anti-spoofing rules on the Barracuda block the incoming mail because the domain it was from is our internal domain. I have whitelisted the mx-res.cisco.com address, 216.206.186.134, but I am still receiving block messages like below (I removed the actual e-mail address):
Your message did not reach some or all of the intended recipients.
Subject: Test 1
Sent: 10/15/2009 7:36 AM
The following recipient(s) cannot be reached:
(removed) on 10/15/2009 7:36 AM
The e-mail system was unable to deliver the message, but did not report a specific reason. Check the address and try again. If it still fails, contact your system administrator.
mx1.res.cisco.com #5.0.0 smtp; 5.1.0 - Unknown address error 550-'Blocked\x00\x006' (delivery attempts: 0)
First of all, are there other IP addresses I should be whitelisting for Cisco RES outbound e-mail mail servers? What else do I need to do? I don't want to turn of the anti-spoofing, due to the spam we would receive.

With the recent CRES upgrade IP address range used for mail delivery has changed. Please refer the below posting.
https://www.ironportnation.com/forums/viewtopic.php?t=1482
Best,
Kishore

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Need help with Exchange 2010 Spam filter setting

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In Exchange 2010 there is built-in anti spam setting as well as Forefront Protection 2010 for Exchange Server. But this doesn't give privileges to the end user who could access it using any web URL where they could set whitelist/blacklist etc.
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Yesterday I downloaded and booted an ISO of Linux Mint 16 because I was curious about the current state of Linux and whether it would make sense to finally switch from Windows. The OS booted and ran without any major issues and seemed generally well-polished.
Then I ran Thunderbird and did a quick setup of my POP3 e-mail account (provided by GoDaddy) using the default configuration, which I assumed would be appropriately configured for someone who wanted to give Thunderbird a test-run. I waited a few minutes while Thunderbird downloaded all the e-mail messages from GoDaddy's server and then I spent some time poking around with the program. Seemed fine.
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Thank you for your suggestions, but I had booted Mint directly from the DVD and had not installed it. I was simply testing it out. Thunderbird was remarkably easy to configure - I just gave it my e-mail address, name, and password and it figured out the rest. But nowhere did it indicate that it would remove downloaded messages from my mail server by default, hence my shock and dismay.
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The only way to recover from this is to reset your password using iForgot:
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SPAM filter problems

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Tim,
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Click to open this script in your Script Editor<pre style="font-family: 'Monaco', 'Courier New', Courier, monospace; overflow:auto; padding: 0.2em; font-size: 10px; width:500px">tell application "Mail"
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The Best Spam Filter for Mail

Here is the best smap filter for mail:
http://c-command.com/spamsieve/
I don't know why Apple don't buy that company and include the spam filter on mail, that would be great because spam is getting worst every day, and people than don't buy this type of spam filters need to delete a lot of spam mails every day.

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SPAM filter setting for CRES secure e-mail

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