<div>
Sonicwall, has an Email filtering system and a web Content Filter . But for heavy duty email filtering with user-access to the greymail etc., consider the separate Sonicwall Email Security appliance. <br />
<br />
You don't say how big your network is. 
</div>


Sonicwall, has an Email filtering system and a web Content Filter . But for heavy duty email filtering with user-access to the greymail etc., consider the separate Sonicwall Email Security appliance.

You don't say how big your network is.

<div>
Any reason why this question was closed with C grade?
</div>


Any reason why this question was closed with C grade?

<div>
<div class="content wysiwyg-content">
Hi<br />
<br />
we are looking for device which can serve the purpose of emal web filtering, web url filtering, web mail, firewall features etc. Can someone advise what are the stable, best device available in the market in reasonable price. <br />
<br />
Thanks
</div>
</div>


Hi

we are looking for device which can serve the purpose of emal web filtering, web url filtering, web mail, firewall features etc. Can someone advise what are the stable, best device available in the market in reasonable price. 

Thanks

Email spam filtering and Web URL filtering and Firewall funcationality

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.

AntiSpam

Hardware-based firewalls provide more sophisticated protection for inbound and outbound traffic than the simple Windows software firewall or the basic NAT firewalls found in routers. These devices implement techniques such as stateful packet inspection, deep packet inspection, and content filtering; and may include built-in antivirus and anti-malware protection.