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If you're familiar with Barracuda (very good spam filtering system), stick with Barracuda.<br />
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There are many other good ones + Barracuda is one of the best.
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If you're familiar with Barracuda (very good spam filtering system), stick with Barracuda.

There are many other good ones + Barracuda is one of the best.

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That depends on your requirement. if you dont want any data goes through cloud you can use onpremise solutions. <br />
I am using greencloud email security. They have URL rewrite/URL defense and temporary email access when the server goes down.<br />
They are using Proofpoint engine.<br />
<a href="http://greencloud.live" rel="ugc">http://greencloud.live</a>&nbsp;<br />
You need to fine tune up the server as well to accept emails only from cloud server IPs.
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That depends on your requirement. if you dont want any data goes through cloud you can use onpremise solutions.
I am using greencloud email security. They have URL rewrite/URL defense and temporary email access when the server goes down.
They are using Proofpoint engine.
http://greencloud.live [http://greencloud.live] 
You need to fine tune up the server as well to accept emails only from cloud server IPs.

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Using a cloud based system also shields you from dos attacks
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Using a cloud based system also shields you from dos attacks

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We are planning for Dedicated Mail &nbsp;Server in Our Data Centre. Existing 100E firewall is connected. Existing 100E spam filter is Good &nbsp;or Baracuda Appliance Or Cloud based Spam filter is good. Please recommend.
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We are planning for Dedicated Mail  Server in Our Data Centre. Existing 100E firewall is connected. Existing 100E spam filter is Good  or Baracuda Appliance Or Cloud based Spam filter is good. Please recommend.

Spam filter Recommendation

Various techniques are used to prevent email spam (unsolicited bulk email). No technique is a complete solution to the spam problem, and each has trade-offs between incorrectly rejecting legitimate email (false positives) vs. not rejecting all spam (false negatives) - and the associated costs in time and effort. Anti-spam techniques can be broken into four broad categories: those that require actions by individuals, those that can be automated by email administrators, those that can be automated by email senders and those employed by researchers and law enforcement officials.